How about this:
Bring up the machine in question, let it register and obtain the bad IP.
Shut down the machine without unregistering it.
Plug in a cheap Linksys router, or some similar box, connect the PC to
the router and rerun the DHCP registration. This should register the
MAC of the router and give it a different IP. Of course now, the PC
will be behind a NAT firewall, but I wouldn't think that should present
a problem in most scenarios.
Michigan State University
Resource Center for Persons with Disabilities
120 Bessey Hall East Lansing, MI 48824-1033