Alot of times the proxy server setting does get hijacked with in IE. Go to Control Panel. Open Internet Options. Click Connection tab and then LAN settings. Unchceck first Bypass proxy server for local addresses then uncheck Use a proxy server for your LAN. Click ok to close, click Ok to close. Open IE and see if you are connected.
If this does not resolve your issue, you will need to Read the instructions HERE
and post the requested logs HERE
. We do not deal with virus infections in this area of the forum.
, please start your own thread next time. Although your issue seems to be the same your systems are quit different in many ways and Tom's solution may not work for you.