LATE NOTE : Please do post a comment if this was helpful !
Symptoms :
That usually happens when you have a problem assigning an ip address to your computer , ( Computer wont get an ip even when the DHCP server is available , an IP conflict scenario ) …
Anyway the Virus/Trojan tends to damage Windows (Winsock) / LSP (Layered service provider) , And no matter what you do ( repair , release , renew , replace your NIC , a new CAT5 cable , reinstall drivers etc … ) it wont work …
I have found couple of utilities that does the job , it will repair Winsock LSP and remove the virus/trojan …
1: LSPFix
URL :lspFix Linkage
Snap shot :

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2:WinsockXPFix
URL: WinsockXPFix
Snap Shot :

Note: You can copy any of the above on a floppy disk , usb Drive or CD , they are tiny and free .
Happy surfing