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Remove Policies Set By Infections
Repair Winsock & DNS Cache
Here is a check list.
If after using HijackThis or cleaning out infections, connection is lost.
Infection has enabled proxy
Start > Control Panel > Internet Options > Connections > LAN settings, untick > Use a proxy server for your LAN. Click OK twice.
If an infection has disabled your connection.
How to repair TCP/IP and Winsock
Reinstalling TCP/IP in Windows XP/Vista/7
Manually restoring the Internet connection
How to configure TCP/IP
On the General tab, make sure "Obtain an IP address automatically" and "Obtain DNS server address automatically" are both ticked.
Right click Local Area Connection > Repair.