Where is the cheapest place to get my laptop fixed? Internet problems.

Where is the cheapest place to get my laptop fixed? Internet problems.

When I get on the Internet a screen pops up every time and says call this number you are going to have a virus on my computer. Called the number yup have a virus need the best cheap place to get this fixed. Please where are places I can get this fixed that won't cost over 80 bucks :(??