Replace the BIOS setting battery with a flat one. That causes all SORTS of problems, many of which are difficult to track down as they can masquerade as software issues.

Set the pagefile size as small as it will go (2MB? or 0?) and complain that the machine runs really slowly. Make sure it only has 256MB of ram for maximum pain.

Rename explorer.exe to something else?

pca
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Experience is what you get just after it would have helped...