|tap f8 on bootup and see if you can get into safe mode with networking, be sure ethernet is plugged in. Then you can download winsockfix.exe and see if that fxes your connection.|
Another thing to try is to open IE, click on tools/internet options/connections/Lan settings and uncheck use proxy server.
If you can get online then be sure to run lots of different FREE spyware cleaners as I'm sure Bearshare left it's share, tha's for sure.
Some HELP in posting on Computing.net plus free progs and instructions Cheers