|Possibly a hardware fault (MS error messages are often rather misleading).|
Unfortunately there are many possibilities. RAM, HD, PSU etc.
Might be worth cleaning RAM edge connectors with pencil eraser then popping the sticks in and out a few times to ensure there is no oxide on the socket. You could do the same for any edge connectors and while you are in there ensure all cables are firmly home.
There are free downloadable RAM tests available for CD or floppy if you want to check that out. For the CD version you need to go into BIOS to set the CD ahead of the hard disk so that it will boot with the CD in the drive from power on.
Always pop back and let us know the outcome - thanks