If you have suddenly lost your Internet connection after removing spyware (such as NewDotNet) the following steps will help restore your connection. This works for Windows 9x/NT/2000/XP.
1) Download WinsockFix.exe from http://www.winsockfix.nl.
2) Run WinsockFix.exe.
3) Click the Fix button.
This program will clean up your TCP/IP connection and rebuild the database. After the program is complete, reboot and your problems should be resolved.