Windows 64 bit install error

I was trying to (clean) install Windows 7 64bit, but after "Copying Installation files", about 65% i got the following error: "0x80070570: Windows cannot install required files error..." . i found some description about this poblem,so I tried different things like:

• changing memory modules, or using just one slot
• using different installation media
• after the failure try again from the "Install now" screen

but none of them worked. I downloaded windows 8 64 bit msdn and i got this error again. So I dont have any idea what's wrong.

Configuration: - Intel Core2Duo E6550 - Gigabyte motherboard with Intel G31 chipset - 2 x Corsair 2GB DDR2 @800MHz

Should i change something in BIOS? Any Suggestions? Thank you.

PS: 32 bit installation works fine.

Error 0x80070570 means a file is corrupt:

D:\>err 0x80070570
# as an HRESULT: Severity: FAILURE (1), FACILITY_WIN32 (0x7), Code 0x570
# for hex 0x570 / decimal 1392
  ERROR_FILE_CORRUPT                                             winerror.h
# The file or directory is corrupted and unreadable.
# 1 matches found for "0x80070570"

Download the ISO again and verify the hash of the ISO.