Windows 10 is behaving strangely, and I want to use DISM to fix any corruption as a last ditch attempt to fix it before I do a clean reinstall. I've ran sfc dozens of times, and it reports that it was able to find and fix corruption every time. But clearly something is wrong because I run it, it finds and fixes corruption, I run it a second time, and it finds and fixes corruption a second time. So it's clearly not fixing the corruption. Lately it's started stating saying that a reboot is required before I can run the command, despite rebooting several times. Very odd. I want to try running DISM from my bootable windows 10 pendrive, using a brand new Windows 10 iso stored on my external harddrive (found at A:/ISOs/win10.iso) as the source image. If that doesn't fix the corruption, nothing will. I want to: 1) Boot my windows 10 pen drive and open the command line 2) Use DISM to revert pending actions on my offline bootdrive C: (so I can run sfc. I think the command will look something like DISM /image:C:\ /cleanup-image /revertpendingactions /ScratchDir:C but I need help with this. Is cleanup-image part of the path? What is cleanup-image ScratchDir? Hard to see what's a path and what's an argument!) 3) Use DISM to fix my offline bootdrive (C: installation USING the iso stored on A:, found at A:/ISOs/win10.iso However the DISM command is very tricky to use which is why I need your help. It's hard to see what's a path and what's an argument in the documentation. So could I have 2 very clear example DISM commands that I would run to achieve steps (2) and (3) please. Remember they are being run on an unbooted, offline image. Thankyou.