Open the case and clean out all the dust bunnies with a can of
compressed gas.
Pay particular attention to the cpu fan and the openings of the PSU.
Boot and confirm that all fans, esp., the cpu fan, work well.

Use DocMemory to test memory overnight:
DocMemory (ver 2.0) PC Memory Diagnostic Software
http://www.simmtester.com/PAGE/products/doc/docinfo.asp
Create the bootable floppy and run the program overnight.

or Memtest86
http://www.memtest86.com

--
Jack E. Martinelli 2002-04 MVP for Win9X / DTS
Help us help you: http://www.dts-L.org/goodpost.htm
http://www.microsoft.com/security/protect/
Your cooperation is very appreciated.
____
"Frankie" wrote in message
...
My PC locks up after being idle for about 3 or 4 hrs and
the mouse freezes, the only way I can get it out of this
state is it off and back on, it reboots just fine but this
reboot does not solve the lock up problem.......I am
running Windows ME platform......Help