For background info pc has an athlon xp 2600 running on an Asus AV7880 with 1 512MB stick of Ram and a 74GB Raptor as system drive and Maxtor as secondary drive. The pc had been running perfectly in this configuration for 2 years. One day out of the blue I got the following message when trying to boot from xp pro. "the following file is missing or corrupt:WINDOWS\SYSTEM32\CONFIG\SYSTEM". I tried "chkdsk /r" from the recovery console but after about 50% got the message "The volume appears to contain one or more unrecoverable problems". I then tried fixmbr and got the message "This computer appears to have a non-standard or invalid master boot record". Fearing a hardware issue I ran the WD diagnostic tool to check my raptor for errors but it didn't find any. Then I ran memtest which found my 1 stick of ram had multiple errors during test 5. Based on the memtest result I bought a new stick of ram but when I put it in I got the message NTLDR is missing instead of the previous error. So I ran memtest again but on the new stick of ram and it had no errors. At this point I was pretty fed up so I decided to format the c: drive and reinstall windows. Bizarrely the xp cd was now seeing my c: drive as having only 8MB of free space out of 20GB (was at least 10GB free previously). It was also now showing up as a FAT drive instead of NTFS. This made no sense to me but I decided I'd reformat the c: Drive as NTFS but windows said it couldn't do it and that the drive may be damaged. I then used the WD diagnostic CD to do a low level format to the whole drive to essentially start from scratch. I then started the xp install routine again but once again windows said it couldn't format the drive. So I ran the hard drive utility test again and it found no errors for the second time. I'm now at a complete loss as to what to do. Any help would be much appreciated!!!