First of all remember there is more than one way to skin a cat. You don't mention why you cannot get on the Internet but I will assume it is the virus that is preventing you from doing so. Before proceeding try and identify the virus. If you can there may me a manual method of removing it, if this is the case you have won a watch. Here goes for the easy fix (remember it never goes to plan):
1 Ask a friend to download a copy of Antvirus programme to pendrive or other media. Do not connect another computer to yors, you may infect it.
2 Boot your PC in to safe mode if you can.
3 Load Antivirus programme from pen drive
4 Run the programme
5 Get back on the net and download updates and rerun the software
5 Follow instructions, if you are stuck visit my site www.ourtechguy.co.uk or mail me and I will help
Gordon Southgate, March 2012