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The problem points to the motherboard BIOS,that needs to be updated.
This behavior can occur because Windows Setup flushes the L2 Cache as it initializes athe PCI-to-AGP Bdige.
The work around you have applied by diabling L2 cache
Locate downloadsites to see if you can find flash bios update
see manufacturers site,www.windrivers.com,www.driverforum.com,wwww.driverhq.com to locate a bios update.
Ref:Q187612-Microsoft knowledgebase article

lower the multipier speed of your cpu.lower also the memory used by your videocard particularly if there is memory sharing feature in your mtherboard. these can be configurable at the bios of most of the modern motherboard.

Try switching the memory sticks! If you only have one stick try buying some others. Look at the main board book and buy what it tells you to. Protection errors are memory errors and even tho you use what you are suppost to, main boards need what aresuppost to be there.

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