virus on browser?

I am having trouble with my laptop. I have difficulty logging on to the internet through my cable connection. Already done trouble shoot with RoadRunner, they suggest I may have a virus running on my browser. I have heard Explorer has problems, that what I use currently. Any suggestions, and how do get rid of it if it is on the browser. I have done scans with Adaware and Avast, both come up clean.

I have difficulty logging on to the internet through my cable connection.
Can you let us know what the errors/warnings are that you receive and what do you mean by difficulty?

What is your OS?
What is your firewall?