Did you not find new.net or webhancer in add/remove program?
It is very hard to help you without seeing a hijackthis log.
You can burn this tool below to CD from an uninfected computer and bring it to your computer and install and run it and see if it helps but like I said your computer may be beyond repair without taking it to a local computer shop in your area.
1.) Download
WinSockFix. (by: Option^Explicit)
2.) UnZip WinsockFix.zip (Pay close attention to where the file is extracted to.)
3.) Run WinsockFix.exe.
4.) Click the Fix button.