I purchased win 7 64 bit DVD to wipe out windows 8 on lap top it is also 64 bit. Bios is set with 8 no go on install.
I purchased 500 gig 6 gig/s lap top harddrive , so I had these two items, purchased 750 watt ultra lsp power supply
ASUS mother board, 4 gig times 2 DDR3. I3 2120 processor, and DVD writer, My case is a super case a long while back
I built xp on it. It is now win 7. I built a bracket so lap top harddrive is mounted and slides right in slot giving it a lot of room to run cool. I should have done this sooner a lot better than XP:)