I made some post for him too.
Use PERFMON under windows XP/2000/NT and setup some counters for CPU, NIC, HD & MEM. This will reveal what device is most intensively used.
Use procexp.exe from
http://www.sysinternals.comto reveal all those process & missing dll's.
Discharge residue power from the motherboard.
Un-plug power cord, power pc on, re-plug power cord, then power on again.