IP address lease denied

[Guest chuc34108]

Help! Have been digging deep into wife's computer and am stumped.

She is running Windows XP on a Toshiba Satellite.

She unfortunately got stuck with Vista Virus 2008 (i think that's what it

was) It kept popping up windows and blocking all attempts to remove. I ran

Spybot and Ad-Aware and finally SmitfraudFix. Nothing worked so I eventually

used system restore to reset the computer to two weeks prior.

Since then, however, I have not been able to connect to the internet.

We use a wireless router and cable modem and it shows them all connected and

other computers in the house are able to connect.

When I dug into System Information I see the following message post whenever

I open Firefox (default browser) or Internet Explorer:

*The IP address lease 192.168.1.100 for the Network Card with network

address 0011F5A7854B has been

denied by the DHCP server 192.168.1.1 (The DHCP Server send a DHCPNACK

message).a:*

I'm totally lost!

From similar questions I can tell you that address is assigned by DHCP

 

Anyone able to solve this? Need more info?

All help greatly appreciated...