Please help, pc is hanging on windows

[andreweddy]

Hello,

installed 2 new ati radeon 5770s in crossfire and once catalyst is installed and the computer rebooted it just hangs on loading up windows 7. Version of windows is windows 7 ultimate. Power supply is a 1200 watt coolermaster power supply. Motherboard is an asus p6t pro w, corsair 6 gig ram, and case is an antec 1200, cpu is core i7 920 with a big zalman fan + runs at 35c any help welcome cheers,

o and windows was a fresh install.

 

[king smp]

use your Windows 7 disk to boot up and do a repair install

also could see if you can boot up in safe mode (usually hit Delete or F# on startup)
if you can boot up in safe mode remove your drivers and try a different set of drivers

use Driver Sweeper to get rid of all old drivers fo graphics
careful dont remove other Nvidia/AMD/Ati devices besides graphics