See
http://support.microsoft.com/kb/929777
Remove 2GB of the RAM, install Vista, apply Windows Updates (which will
include the hotfix), then install the extra 2GB RAM and all will be well.
"Nt86" <> wrote in message
news:9FFBBA15-0CF3-4D26-AC83-...
> back in june i built a custom computer designed to run windows vista. it
> has
> 4 GB of ram, a 250 GB Sata drive, core 2 duo processor from intel, intel
> motherboard with onboard video, 2 DVD drives, one with +RW and
> lightscribe.
> no PCI add ons, no IDE HDDs, and a floppy drive. another computer i had
> built
> 2 years ago that has SATA drives and it runs vista flawlessly on a pentium
> 4
> and 1.5 GB ram. back to other computer, it runs windows xp media center
> edition with no toruble, but when you try to upgrade to vista, it gets
> stuck
> at 21% of the extracting files part of the installation. the good news is
> the
> installation restores xp automatically whenever it(and it always has)
> failed. if anybody knows how to make this work, plese lemme know. i might
> have some IDE drives laying around if that will work.