I am using a P-III Win98 SE system. For the past month my system has been experiencing a lot of problems, especially totally random sponataneous restarts. I have tried switching RAM cards, tested my HDD on another system, run multiple anti-virus scans including Stinger, AVG, & ESET online scan (and all of them have shown no virus), all to no avail. I formatted my HDD and re-installed Win 98. The computer starts up normally but the restart problem remained. I again formatted the HDD and installed Win2000 Pro, the installation was normal but the system invariably restarts before the bootup process is over. I again re-installed win98 SE and the computer works normally sometimes for long periods and then suddenly restarts for no rhyme or reason. Yesterday, when I started up the system, I got a number of "invalid command" errors during startup. I ran MSCONFIG and checked the Autoexec.Bat files. If I am not mistaken, normally, the Autoexec.Bat file should contain around 3 or 4 commands in intelligible english, however I found that the file contained almost 9 or 10 commands all of which were a combination of a few english alphabets and a lot of odd looking symbols. I am absolutely certain that this problem was not there the last time that I started my computer. I am puzzled as to what could have happened overnight in a shut down/power off computer to create this error. I would really appreciate any help/suggestions to sort out this problem.