I am having computer problems with my old (5 or 6 years (maybe more)) windows 98 computer. We do virus scans and other computer utilities (defragmenting etc) often. However, now we have a problem that happens whenever we start the computer up, not allowing us to access desktop or any other of the computers files.

Whenever we start up the computer, it shows the windows 98 loading screen, but then turns black. In white text, there is:

Code:
Invalid Boot Diskette
Insert Boot diskette in A:
That's it. Nothing else. Pressing any key just causes the message to repeat itself. Restarting the computer doesn't help. Waiting for a few days then starting up the computer doesn't help (not much difference then just restarting I guess).

Help!