on your hard disk, that's for sure. It totally depends on the situation what can be done, or what should be done. If you're not knowledgeable of using the usual diagnostics (like fdisk /status, chkdsk, scandisk, MS-DOS) you'd better find professional help. Otherwise, go and research.
Hope this helps.
when starting win 98 os I get this message in a red screen. I hit ok goes to win 98 setup screen. then goes to page fault explotrer error shutting down. tried to reload 98 says must delete old partion, says does not recognise as ms application. Thought I would then try win 2000 upgrade, says must delete partion to go on. Is my existing files on hard drive damaged or can I salvage them