Windows licensing makes my head spin
I have a friend that wants to upgrade her Vista machine. 64 bit home premium. To top it off, it's an HP computer. She want's to do an upgrade, and not a clean install
I want to steer her towards buying the correct Windows 7 version. I assume (I hate assuming) the HP OEM version is going to give her a hard time. Can she do an upgrade with a Win 7 retail version?