So I am fairly tech savvy been tinkering for years, and excuse me for asking such a newb issue but I could not find a simple answer on google or here pre existing. I am finally getting a fair amount of friends with Windows 7 machines that want to F&R. Well 99% of pcs sold now do not come with restore discs. So I have downloaded all kinds of "OEM" discs off torrents, but I am a little confused on the differences between versions. And by that I mean for instance I downloaded a Windows 7 Home Premium 32 Bit OEM copy and used it on a friends gateway laptop as that is what it said it was stickered for. Well in 30 days it said it could not activate, may be pirated, etc, etc. I even tried phone authorizing it with microsoft, no luck. What do I need to be looking for to signify what disc to use. Also when I look on torrent sites and search for instance "Windows 7 pro oem sp1" I see too main things popping up a "RTM" version, or a "N" version. Please help! Sorry for the dumb question