The user told me that after inserting a friends USB drive into his laptop (XP SP2), that he was unable to access the Internet. The problems affects both IE7 and Chrome.
Other problems included a broken BitDefender 2010 (The firewall would not switch on) and a broken system restore (I finally got it to restore, but only after running it in safe mode. Internet worked for a while after the restore but was sporadic and is now broken again).
I followed the steps on the Malware and Spyware Cleaning Guide and have tried installing and scanning alternatively with BitDefender, AVG Free, Avira, AVG Antispyware, MBAM, SUPERAntiSpyware and IOBIT Security 360 PRO. Picked up a few tracking cookies but nothing else.
I eventually discovered that I could access web sites if I used their IP addresses and have since tried several fixes. ipconfig /all shows nothing different to the settings on my computer and the dns servers are the same. Have also tried some winsock fixes but nothing seems to work and I'm at a dead-end.
Can anyone suggest a way forward?