"It's happening when you are installing mobo drivers then? make sure you're installing the appropriate 64bit drivers, are you using the drivers from the cd that came with the mobo or have you downloaded them?"tried boto mobo dvd and softwares from gigabyte site,both times it crashed.it crashed even when i tried to install my graphics drivers.Even if i dont install anything and just restart it,blue screen appears or if i choose to repair,it initiates repair and fixes it for one time use which also has a chance of 20%.anyway the problem only occurs for 64 bit