It could be a problem with your ram
Download memtest86 and check that your RAM are working. Also it could be
oevrheating you should get intel active monitor and take a look at your
temperatures
its free you can download it here
http://www.intel.com/design/motherbd/active.htm

"Guybrush Threepwood" <spambak@hotmail.com> wrote in message
news:pan.2006.12.10.15.57.23.676867@hotmail.com...
> I've changed the PSU of a computer with Windows 98 installed onto. The
> system boots ok, and Windows is starting without problems, but whenever I
> try to access the C drive or the cdrom the computer just freezes. The only
> think I can do then is pressing the reset button. Any ideas what might be
> the problem?
>
> --
> "Don't worry about people stealing your ideas. If your ideas are any
> good, you'll have to ram them down people's throats."
> -- Howard Aiken
>