truemobile 1300 problems plz help

Well my wireless has been working fine for 2 months now.  But all of a sudden i cant browse and ping anything, even though I have excellent strength.  Ive tried reinstalling drivers, resetting modem, releasing/renewing ip etc.  Ive even talked to my friend at toshiba who gives me modems and he trouble shooted me but to no prevail.  Im using a pcx5000 atm if that helps.  I can connect fine to the modem's settings where i can see all my connections etc.  But cant do anything else.  When im wired the internet works perfect.

Let me know if you need me to tell you anything else about my problems.

The IP address lease 192.168.100.124 for the Network Card with network address 000D5639019F has been denied by the DHCP server 192.168.100.254 (The DHCP Server sent a DHCPNACK message).   I'm getting this message ever since its been messing up so if someone could please point me in the write direction.