I have a virus on my computer that I got about a month ago. For the most part I can still operate everything that I need to. but the other day I went to open my money software program and realized that the virus was affecting an aspect my program. Because of this I need to know how to choose an antivirus tool. There are so different companies out there trying to sell me their product that I feel completely lost. What is best? Should I go with something more expensive, or is there an affordable program out there that will do that job?