One sick computer

We came home from our trip to a computer virus on our desktop. (I'm typing on the laptop.) Our friend from Kansas, that is staying with us, accidentally opened a email that had it. It has been one nasty bugger to get rid of. I have ran three different anti-virus programs and our computer neighbor helped out, but we still have something that is messing up the computer. Every day I have ran anti-virus and it finds something each time. We may have to take it to a specialist.