reinstall windows

Here's what happened: I was trying to reinstall windows using partition. It all went well until I accidentally deleted the partition containing the windows ISO file but not my local disk C and so I panic and thinking that quitting the process would revert the process. It did not and now it is...

I ran malwarebytes afterwards to make sure the malware was removed and it was. However, I´m not being paranoid of the leftovers of the malware and need to decide whether I should reinstall my windows which takes hell of a long time and backup my files.. or just feel safe now when I cant detect...