From what you tell (installed OK twice, third time not OK, old computer) i'd try to install it on a new computer.
Kees
I have an old Time computer which had XP on it. I bought a genuine win 7 professional disc and installed it no problem.However, after a time i was getting problems with a printer which was creating havoc so tried to do a reinstal. I didn't have enough space on my hard disc, so I wiped it clean and reistalled no problem. Then this printer went bad again so I uninstalled it. after do the uninstal it said restart your computer. I did this and was then unable to boot up. I thought I would be clever and do a wipe again and reinstal. now the instalation goes okay until right near the completion and then the computer switches itself off. I've tried all I know( which is very little!!!!!!) but no joy. Anyone any ideas to help an foolish old man?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic