539GB used by Windows 10?!?

We've got a 2009 iMac 24" that has been via BootCamp for the past many years running Window 7 and recently Windows 10. Unfortunately, I've allocated as much space to Windows as I could of the 640GB HD since we are not using OSX. In the past year or so, I've been seeing that our Windows 10 iMac running low on space. So I would clean-up programs that I didn't use, freeing up a few GB here and there. Today, I found that I have 2MB left. Yes, 2 MegaBytes.

I checked and found some funky information from Windows telling me they are allocating 539GB of space. Can this be true?

I've taken some screen shots of the HD itself and not sure really what is going on and any help would be appreciated.

Thank you.

You should not delete any system files belongs to Windows OS these system files stored in C:\Windows folder and its subfolders.


The Deployment Image Servicing and Management (DISM) tool can be use to analyze the size of the component store and reduce the size of the component store (WinSxS folder). The WinSxS folder is located in the Windows folder, for example C:\Windows\WinSxS. It’s the location for Windows Component Store files. The Windows Component Store is used to support the functions needed for the customization and updating of Windows. Component store (WinSxS folder) contains all the components that make-up Windows to allow you operate your system. These components are kept to rollback any problematic change or to repair a file that becomes corrupted.


Open the Command Prompt as a Administrator.


Reduce the size of the component store by typing following command:

Code:

Dism /Online /Cleanup-Image /StartComponentCleanup

You can reduce the size of the component store further by adding the /ResetBase parameter. The installed Windows Updates cannot be uninstalled after the '/StartComponentCleanup' with '/ResetBase' operation is completed.

Type following command:

Code:

Dism /Online /Cleanup-Image /StartComponentCleanup /ResetBase

You can use WinDirStat program to find out sizes of files that are taking more disk space than other files and delete files you don't need.

Clean all temporary files with CCleaner program.

Open the Command Prompt as a Administrator.

Code:

 Net stop wuauserv 

Rd  /s  /q  %SystemRoot%\SoftwareDistribution

Above command will delete folder where cache of Windows updates stored.