Computer suddenly reboots itself

The computer started suddenly rebooting itself about a month or so ago. Last
week we reinstalled a newversion of Windows XP, using a clean install. It
didn't fix the problem though, it seems to happen more often now, during no
specific programs being used. In the "Even Viewer" the error reads:

The COM+ Event System detected a bad return code during its internal
processing. HRESULT was C0000005 from line 44 of
d:\qxp_slp\com\com1x\src\events\tier1\eventsystemobj.cpp. Please contact
Microsoft Product Support Services to report this error.
For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.


It also seems to lose the quick launch toolbar on these reboots.

Thanks to anyone who has some ideas that might help.
.

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