I registered it on my computer my computer in bad shape. I need to use the oem again can I use it on my computer even know I registered it. I don't Have a back up because I know what i was going to use it for. My friend got on my computer with out my permission and he messed it up. If not I'm going to make him give me the money for a new oem.
I've installed oem copies of every o/s many times on different hardware (one at a time) and the worst I had to do was call M$ to activate if the installs were close together.If there was a period of time between installs it activated just fine.