You said the fan is running. If its the same fan as indicated in the bios
error, could be a few things. The feedback of the fan speed built into
the fan may be defective, replace the fan. The fan may be turning too
slow, replace the fan. The feedback line pin on the motherboard is bent
over under the fan plugin connecter, straighten the pin. Inadequate +12V
amperage, replace power supply.
The bios usually contains: the perceived current speed of the fan, and,
the speed at which the fan will cause the PC to shutdown.
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Noncompliant
For corporate legal advice regarding the EULA for XP, check with a lawyer
qualified in corporate law.