DX10 help please new build

Hi

Just built a new pc with the following.

Vista 64bit
Intel Core 2 Quad 6600 CPU
Asus P5E3-Dexluxe mother baord.
Asus GTX 260 grahics card
4 gig of DDR 3 - 1333 OCZ ram ( 7.7.7.20)
Sansung F1 Spinpoint T1 Hard drive
LG dvd burner
Antec 850 quadro psu
Antec 1200 Hundred case ( love it lol)
Frezzer Pro 7 CPU Fan
Case fans set on defualt
temps go no higher then 36 oc

My issue is the following games work fine.

But as soon as I try to load Crysis in DX 10 mode it wont even start yet ok when DX 9 selected.

Bioshock starts fine DX 10 greyed out.

I cant tell if CO4 is running in DX 10 or not though it looks amazing.
Commany of Heroes crashes when DX 10 is selected

Any one got any ideas please?

Do I need to do anything in Bios?

Ram Volt is at 1.80 only thing changed

Thank you for your time.

  Technotiger 09:07 05 Oct 08

I am no gamer, but I would have thought that the obvious solution is not to bother with DX10. As I understand it, there are not yet many games that can take full advantage of DX10. If all your favs work Grreat in DX9, just enjoy!!

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