hello, I’m in desperate need of help: I was getting lock-ups during Bad co 2 and my XFX 5770 fan was loud. I took the video card out and blew out the dust as well as changed power connectors. When I went to reboot, the BIOS in the ASUS P55d stated I changed the CPU and was loading defaults. The system started fine so I thought nothing of it. Still had problems with Bad CO 2 so I contacted XFX support. They suggested several steps including MEMORY test. I ran the windows 7 memory test extended overnight. When I went to get on to the computer, it would not boot. I ran the windows repair several times and tried earlier restore points all to no avail. I went through the BIOS and saw the hard drive was under IDE mode --I had originally set it to AHCI. I set it back --still no boot. Further investigating showed that the drive letters were all different. C: was empty and Windows was on E. Is this problem? If so how do fix please?
4 gig 1600
Windows 7 64 bit
"The choice, of whether you would be using AHCI or IDE, is done prior to installing the operating system on the computer as switching from one to the other after would often lead to the system not working properly if at all. Most operating systems now have patches to address this problem but specific steps needs to be followed prior to switching."