Hallo! Thank you! Computer: Asus CM1740 Hard drives: Seagate (W7 old install) + Western Digital (W7 old install and new 2kpro install). Both 160gb (not sure of speed). OS: Win7 Home Premium x64 At first I tried just putting the hard drive in and going. No go. Then I tried using the Win7 disc to get into start-up recovery. No go. Then I tried putting in my secondary (no important info) into the computer and using the Win7 disc to format. No go. Then I tried reformatting with Win2kPro (it was one of the other OS discs I have lying around, sorry...) and installing... yes, it worked! Except, as much as I loved 2kPro, I cannot to use a 13yo OS. I am getting two errors: PAGE_FAULT_IN_NONPAGED_AREA and IRQL_NOT_LESS_OR_EQUAL. The page fault error is more prevalent. Here are the technical codes at the bottom: PAGE_FAULT_IN_NONPAGED_AREA: STOP: 0x00000050 (0xFFFFFA8000F400000, 0x0000000000000001, 0xFFFFF80000CE82139, 0x00000000000000002) IRQL_NOT_LESS_OR_EQUAL: STOP:0x0000000A(0x000000000000000B0, 0x00000000000000002, 0x0000000000000000, 0xFFFFF8000CE80ABF) The errors are occuring when I get to the W7 graphical boot screen -- the one with the Windows logo and colors, etc. When I tried to boot in Safe Mode on the Seagate, it stopped going during the loading of drivers. I was thinking it was the memory -- but memtest + windows memory test both say my RAM is fine. I was thinking it was the BIOS -- but I have the latest version appropriate to W7. Tried already on quite a few support sites. No go so far. Just wondering if anyone had any ideas... thanks much! Any ideas, means of testing components, or other input is appreciated.