What do I do with old Windows data after upgrading to Windows 10?

[Windows Central Question]

Can i delete my old windows data? How can i free C drive?

 

[Tony Clegg]

If you are happy with the install, then yes you can delete this. It's done via the Disk Cleanup program. You will need to click on system files to show the Windows.old folder and files which will help free up space on your hard drive.

 

[Lelouche Lamperouge]

At your own will.