I'm having trouble with my IBM Thinkpad which is running Windows XP. The problem started with a message saying that \\WINDOWS\\SYSTEM32\\CONFIG\\SYSTEM was missing or corrupt. Now I am getting an lsass.exe error saying that the password is not recognized. Then the computer reboots. The cycle continues until the battery dies. I've done some searching on the internet and tried the following things: Booting into safe mode and safe mode with command prompt - still gives me the lsass.exe error Choosing the "last known good" option - BSOD with 7B stop message Using the windows XP disc and choosing windows set up - this option brings me a screen saying: The following list shows the existing partitions and unpartitioned space on this computer. It shows one partition: c: Partition1 <IBM_PRELOAD> [NFTS] 34743 mb < 3108 mb FREE >. Choosing that option warns me that I'm trying to install windows in a partition that already has windows installed. I didn't continue. Using the windows XP disc and choosing repair - prompts for the administrator password. I didn't set a password, so I hit enter which tells me the password is not valid. Is there anything else I can try? Will I lose my data if I choose to install windows in a partition that already has windows installed?