I have a desktop PC I built and run windows 8.1 on. I've migrated the OS to new hard drives twice and changed the motherboard and various other hardware but in the process it has developed lots of weird, intermittent problems that are increasingly becoming a nuisance.
I would like to do clean install, just back up my music and other files to an external drive and then start over. But I cannot, for the life of me, find the original disk that it came on. The packaging for the software says "Win Pro 8 64Bit English 1pk DSP OEM DVD". I need to download an .iso or other file that I can use to reinstall windows 8 (and then upgrade to 8.1).
I found this thread: Where can I download Windows 8 legally, from Microsoft?
But when I ran the EXE and entered my product key (still have the sticker) it says "This product key cannot be used to install a retail version of windows 8"
Is there a similar solution that will work for the version of the software I have? Or is there another way to do a clean install of 8.1?