How do I know if my computer has a virus?

[PrettyBoy]

Well what usually happens is your computer gets a lot slower(OVER TIME),your home page starts to change without your permission,allot of pop ups start to occur online and offline,when your browsing the internet u usually get redirected to other web pages that you weren't trying to go to and those are just a few it really depends on what type of virus it is because different viruses affect your computer in different ways the best thing for you to do is go to http://www.norton.com and download their pc check up application and run it by that it will tell you after it's done scanning your computer if you have a virus or not it usually takes about 10mins depending on your computer it may take longer if your computer is kinda slow