George,
I think you just answered your own question.  IMHO, if the other PC's have 
the sameconfig and are able to get an address, it is most likely a SID that 
is gotten corrupt on the box in question.  I would back up data, rebuild,
and
readd it to the workgroup.
My .02c,
BTW, if you want to block by MAC address, use an access list # 700 - 799.
Robert Hugo
CCNP, CCDA, MCSE
Network Engineer
Ameritech / SBC            
Bloomington, IL.
W: 309-530-2456
H: 217-424-2425




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