YOu did not give much information, but this gets most of the bugs. connect back to the internet and do the following. It really helps if you can tell us the name of the problem.
restart your computer
hit the F8 key
go into safe mode with networking
be patient, its slow
you may have to do this in safe mode
open internet explorer, go to tools, internet options, connections, LAN settings, make sure proxy server is NOT checked and automatically detect settings is checked then exit
download rkill, this is an app that will get rid of the trojan blocking you from doing anything else
install, update, let it run a full scan
save the log
look at the log
see if it has infections and see if they were removed
run this online scanner. allow the download and install it. this is one of the best
hope this helps
If you do connect to the internet, I would check out BLCS.US and call him, Barry (owner of BLCS) is able to take control of your computer via internet and wipe out viruses fast and effectively, while giving your computer a big speed boost. I have used the company many times and I have been happy with everything. Other than that, I suggest downloading Microsoft's Security Essentials onto a flash drive, then plugging it in and running the set up on your computer that has the viruses and running the scan. It should get rid of them quite fast. Also another good one is Malware Bites, and Avira.n If you live in Arizona, BLCS will come to you to clean your computer.
The best site to watch it is http://1tv-pc.com/mobile/ . I daily use that site
Use NOD32, this is the best anti virus i have ever used.
try the google pack or avg.. both are free and very good, www.delete-virus.com/avgfree