[dba-Tech] Puzzling network issue

Hi all,
I've got an odd one to deal with. PC won't connect to a simple network. I
scanned with 6 different AV/anti-malware scanners and three different root
kit scanners. I cleaned it of any infections and unneeded software. I
installed Vipre and SP firewall. I flushed the DNS and reset with netsh. I
tested the wiring. I can get onto every network I've had it on except the
one it is supposed to connect to. The (new Netgear) router dhcp serves
192.168.0.x but it won't serve this PC. The PC goes to a 169. address. I can
connect this PC to another (Dlink) router which dhcp serves 192.168.0.x no
problem. I can connect it to an SMC router that dhcp 192.168.2.x no problem.
All of the routers are working fine with the other PCs in the nets. I can
connect a notebook into this same Ethernet cable and get served. I switched
patch cables. I checked for possible DNS redirectors. I'm beating my head -
I must be missing something.
 
Any ideas?