Internet connection problem Please help?

[zaid a]

I have 3 computers at home, all are connected to the same wifi connection. 2 of the computers have normal internet, I can open webpages and so on but on of them I cant connect to the internet, for e.g I tried opening the web with 3 web browsers internet explorer,firefox and google chrome all don't work, but when I go to the network and sharing center it's says that I am connected to the wireless network and that I have internet access, but when I go to steam, I cant visit the store because they say i have no internet connection but when i go to library and go to black ops multiplayer I can play online as if i have internet. It all started when AVG antivirus said that I have a malware, so AVG asked if I want to remove it so I clicked on remove, that's when the problem happened. Can anyone please help me? much appreciated, Thanks

[Giedrius M]

Check for proxy in browser on infected PC. Disable it.
Run TDSS killer and Hitman Pro to check for infected system drivers.
Most of this guide : http://www.2-viruses.com/how-to-fix-goog...us-problem applies to your situation ( malware changed your Internet connection settings).