Clean C Drive without Formatting in Windows 10/8/7 [Tested & Worked]

Tracy King updated on Feb 22, 2023 | Home >Computer Instruction

This page provides reliable solutions for you to clean C drive and even delete system C drive, follow to see how can you clean or delete your system C drive in Windows 10/8/7 on your own now:

In order to avoid unnecessary data loss issue due to cleaning C drive, please create a backup of important files on your C drive in advance. Professional backup software like EaseUS Todo Backup can help you with this job.

How to Clean C Drive without Formatting Windows 10/8/7

When the computer or Windows system has been running for a very long period, many useless junk files will be leftover in the system C drive. With more and more leftover files accumulating, the computer becomes slower and slower.

So how to resolve this problem? The best and most straightforward solution to this issue is to clean the C drive. Some people may come up with the solution to format C drive. But Windows computer won’t allow you to format the system C drive. Huge file loss or even system error would occur if you do so. 
Here in the below, we’ve gathered two tested and effective methods for you to apply and clean C drive without formatting in Windows 10, 8 and even 7:

Method 1. Clean Up C Drive Without Formatting

You’ll see that Disk Cleanup utility can only remove some temp files and Recycle Bin files on your computer. If you want to remove more Windows built-in application junk files or large files in Windows 10/8/7, you'll need to turn on another powerful partition manager software for help.

To remove all useless files and even large files from your C drive, we'd like to recommend you try EaseUS CleanGenius software. 
It's 100% free and risk-free for optimizing computer performance with its Cleanup feature. You may directly download and install it on your PC, following guidelines below to clean up your C drive without formatting now:

Step 1. Download and install EaseUS Partition Master Suite.

Free Download 

Windows 11/10/8/7100% Secure

download and install CleanGenius

Step 2. Click PC Cleaner and install EaseUS CleanGinus. Then, click "Cleanup" and click "Scan" to start cleaning up the system and make your PC as good as new.

system cleanup step 1

Step 3. The software will scanning all over your computer to find idle data files that take a huge amount of disk space, you can select useless large files, system junk files and Windows invalid entries and click "Clean" to start system cleanup process.

system cleanup step 2

Step 4. When the scan is complete, click "Done" to finish cleaning system junk files.

system cleanup step 3

Method 2. Run Disk Cleanup Utility to Clean C drive

1. Open This PC/My Computer, right-click on C drive and select Properties.

Clean C drive without formatting.

2. Click Disk Cleanup and select files that you want to delete from C drive.

Clean C drive with disk cleanup utility.

3. Click OK to confirm the operation.

Confirm to clean C drive.


After this, you'll get a clean but faster-running speed on your computer. 

Delete System C Drive (Include OS) Without Formatting

Besides cleaning or clearing C drive, some other Windows users are even thinking to delete system C drive (including the OS) from HDD or SSD without formatting. But why do these people want to do so? And how to do it?

Here is a list of reasons why Windows users want to delete a system drive from a Windows computer, and if you are one of them, don't worry. You'll find a solution here:

  1. 1. To perform a clean install of Windows 10/8/7: wipe all data on the system disk is necessary, especially to delete the system drive.
  2. 2. To delete system drive on old HDD after system cloning to a new HDD/SSD.
  3. 3. To delete system C drive on target disk when the OS migration process failed or halted.

How to delete system C drive without formatting? You can apply professional partition manager software - EaseUS Partition Master Pro for help.

Free Download 

Windows 11/10/8/7100% Secure

This software can do the job that other Windows built-in tools or third-party software can't do: to directly delete system C drive and partitions on your Windows disk with a created WinPE bootable disk. 

You can directly activate it into a full version and apply it to below guidelines to delete the system C drive with ease now.

1. Create a WinPE disk

Step 1. To create a bootable disk of EaseUS Partition Master, you should prepare a storage media, like a USB drive, flash drive or a CD/DVD disc. Then, correctly connect the drive to your computer.

Step 2. Launch EaseUS Partition Master, and find the "Bootable Media" feature on the left. Click on it.

Step 3. You can choose the USB or CD/DVD when the drive is available. However, if you do not have a storage device at hand, you can also save the ISO file to a local drive, and later burn it to a storage media. Once made the option, click the "Create" button to begin.

  • Check the Warning message and click "Yes".

When the process finishes, you have successfully created an EaseUS Partition Master WinPE bootable disk. Now, you can manage your hard disks and partitions through the bootable drive whenever the computer fails to boot normally.

If you have RAID drives, load the RAID driver first by clicking Add Driver from the menu bar, which can help you add the driver of your device under WinPE environment, as some specific device cannot be recognized under WinPE environment without drivers installed, such as RAID or some specific hard disk.

2. Delete the system C drive

Now, insert the bootable USB to your PC, restart it and press F2/F8/Del to enter BIOS and set computer to boot from EaseUS Bootable disk so as enter EaseUS Partition Master.

And now, you can continue with the next steps to fully delete the C drive and clean up it for new usages:

Note that this will delete all existing partitions on the system disk, including the OS. So make sure you've backed up all essential content in advance.

Step 1. Launch EaseUS Partition Master, go to the Partition Manager section, right-click your OS disk and select "Delete All".

delete all partitions with os step 1

Step 2. Click "Yes" ton confirm that you are sure to delete all partitions on the OS disk.

delete all partitions with os step 2

Step 3. Click "Execute * Task" and click "Apply" to start deleting all partitions with OS on the selected disk.

delete all partitions with os step 3

Note: After this, you'll just need to wait patiently and EaseUS Partition Master will automatically delete the OS drive and other data partition on your disk.

Note: If you've deleted the system C drive on your current running computer, you’ll not be able to run or boot up Windows system anymore. You can refer to clean install Windows 10, 8 or 7 for tutorial help.


Clean up C drive is simple and easy with reliable methods. If you simply want to free up some space in the C drive, you can apply Method 1 with EaseUS WindowsGenius to help you quickly clean up junk files in the system c drive.

If you want to clean and delete the entire OS drive so as to reinstall Windows, you can turn to EaseUS Partition Master with its Bootable Media for help. It's efficient and quick to execute the operation.

Free Download 

Windows 11/10/8/7100% Secure

FAQs About Clean C Drive in Windows without Formatting

If you have more questions on how to clean C drive or clear C drive without formatting in Windows computers, follow the questions and find answers below:

1. How to clean your computer without deleting files?

Here is a list of tips that you can follow to deep clean your computer without deleting files:

  • Back up all valuable files and data to an external hard drive or cloud drive.
  • Create a backup of useful installed programs and software to an external hard drive. For a guide, follow this link: Backup Apps Windows 11.
  • Then, uninstall installed programs and software.
  • Wipe all the existing partitions and volumes.

2. How do I deep clean my C: drive?

  • Run the Disk Cleanup utility to remove temporary files, delete Windows.old, and system backup images.
  • Unsintall broken or corrupted programs.
  • Empty the recycle bin.
  • Delete File History backup.
  • Clean junk files with antivirus software.

3. What can I delete to free up space on C drive?

  • Uninstall broken or unnecessary programs.
  • Clean useless desktop folders and files.
  • Empty the recycle bin.
  • Find and delete duplicate files.
  • Clean up useless downloaded folders and files.
  • Discard temporary files.
  • Upload files to the cloud drive and delete them from your C drive.

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Updated by Daisy

Daisy is the Senior editor of the writing team for EaseUS. She has been working in EaseUS for over ten years, starting from a technical writer to a team leader of the content group. As a professional author for over 10 years, she writes a lot to help people overcome their tech troubles.

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Written by Tracy King

Tracy joined in EaseUS in 2013 and has been working with EaseUS content team for over 10 years. Being enthusiastic in computing and technology, she writes tech how-to articles and share technical solutions to resolve Windows & Mac data recovery, data backup, partition management, data transfer, Windows update issues, etc.

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