I have a similar issue, I had Windows 7 Ultimate 32 bit installed, I up'd my memory from 2Gb to 8Gb, formatted and started over, decided to use my legal copy of Windows 7 Home Premium 64 Bit and it said press any key to boot from cd, did and during the first process of installation it said could not find driver and would not continue with installation. (Bios was also updated but all settings restored to previous state). Thought this weird and rechecked settings, retried, same error. I then inserted my legal copy of Windows 7 Ultimate 64 Bit and pressed key to continue and it went through the process with no issues and installed. (nothing changed in Bios). This could be and issue where home premium does not have the driver for the SATA port drivers for this motherboard but I didn't really care, just used ultimate any way. I have an Asus M4A77TD, nothing fancy..., so when it looks for drivers, make sure you have the drivers from the cd on a USB key and try accessing them when it first starts up and says press F2 for drivers, F6 for ....., find the drivers on the USB key and see if that works.