Core2 duo
E6600 Processor save $200  2.66 vs 2.4 you wont realy see a differance
An  EVGA 122-CK-NF68-AR nForce 680i SLI     vs     Asus P5N32 SLI motherboard
768MB Ge Force 8800GTX Video card     lots  of card ,do you game?Nothing your running NEEDS a card that powerful. 7900 gto would be plenty.Have anything or will have anything dx 10 ready?
4  80 gig raid 0   2 partitions 1 for os 1 for  programs 2 250 gig 1 for storage 1 for backup 1 250 gig external  for backup  of  backup
2 gigs of RAM   no more      Os will only see 2.5 gig unless using a  64 bit OS . buy very good high quality ram not value ram.Heat spreaders for the ram are a nice thing also.
at least a 19 inch display  go 22 in wide screen. better yet 24 in dell.
min 700 watt power supply.DO NOT SCIMP ON POWER SUPPLY.It is the heart of your system it goes bad or feeds dirty power you can kiss all of your very expensive components good-by.In 1 fatal swoop.
my 3 cents

"Reinstall Windows" is NOT a troubleshooting step.