Does it freeze and shut down or does it freeze and then resume?
If it's shutting down, then it's having a hardware issue. I would start by testing the memory with memtest. Download the iso image (Google it), burn it to CD, and boot the PC to that CD. Let it run for a while (30 minutes or so). If your Mom's PC has more than one memory chip in it, test each one individually.
If the PC is freezing then resuming, then start looking at what software is running in the back ground. Use msconfig.exe (Start/Run/type in msconfig.exe/Startup tab) to stop software from starting with Windows. Uncheck everything but whats related to the anti-virus software.
Hope this helps.
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