What OS should I get?

Hey, my Windows 7 won't work properly (http://windows7forums.com/windows-7-support/70412-random-freeze-followed-whitescreen.html) and no one helps me with that soo..

What OS should I get now?
(When I used XP I did not get any of these errors, IT IS NOT because of old system because mine is fairly new)

XP or Vista?

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