Windows 7: Installing Issues

Hey, when im installing the Windows 7 official beta release, when it's expanding files , my screen just cuts off doing installation and no matter what I do i cant wake it back up. Is this a problem with have a EVGA 260, or just something im not doign correctly, i have delete all the contents off my hardrive and this is a fresh x64 bit Windows 7 Install.

I have an GTX260 and I get the same problem but only when I format the drive at setup, to get around it just leave the incomplete install there and just install it again in the same partition and the second time around it will complete the setup, strange I know but it works and once you have fully installed and logged on just go to your drive and delete the windows old folder and that's it have fun and send some feedback to Microsoft on it.

Will try when I get home.