This is generally the sign of a heat related hardware problem. Check
for excessive dirt build up, loose connections, bad fans, etc.

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Regards
Ron Badour, MS MVP W98 System
Tips: http://home.satx.rr.com/badour
Knowledge Base Info:
http://support.microsoft.com/default.aspx?pr=kbinfo
> My Windows 98 Machine restarts at random intervals, more
> commonly when left Idle for large periods of time. Any
> suggestions?