Good Morning! I have a problem and I am going crazy with it. My PC stopped working and could'nt boot. I had to open the M$ repair options and that said the "ahcix64s.sys" file is corrupted. I started the repair but it didn't worked. So I thought NP I fire up the console to copy a new ahcix64s.sys in the folder C:\windows\system32\drivers and replace the it. But that is somehow a no go. The pc does not boot up and goes back into the repair mode witht the same error message that the file ahcix64s.sys seems to damaged. I have tried multiple files with no luck. Every time I get the same message with different files. Thats somehow strange to me. Why is it doing that? And is there a way to replace the file in general? My problem is, I can't use the systemrecovery since my last systemrestore point is too old. What can I do. Is there a way to copy the file ( new one ) onto the disc so Windows will boot up again? Here are my Specs: Windows 7 x64 BIOS MOD AMI Foxconn Digitallife Life A79A-S Raid 0 AMD/ Raid driver ahcix64s.sys For any suggestion help I would be very glad and thankfull. Addition: I did not tried “sfc /scannow” yet. Will do that and report back. EDIT: Since I can't execute sfc /scannow without booting into the OS, I have no further clue. EDIT2: Somehow I've managed to boot into the OS. But now my USB devices arent working anymore. Thread can be deleted or closed - SOLVED!