look in your installed programs if you have an antivirues some common ones are norton, avg, avast. or check your computers system tray if it is windows on the lower right hand side for any icon that says antivirus.
check your firewall or your antivirus
An antivirus software will prevent, detect, and remove viruses from your computer.
Well it freezes up and you can't use it again only if it gets fixed
Most virus programs check email for you as it comes in and goes out. There is a great antivirus suite called AVG AntiVirus, its FREE http://www.avg.com The program is FREE and checks your computer, IM Chat programs and your email.
By using Antivirus
If your computer is slower than usual or behaving oddly, you may have a virus. Install a virus scanner and scan your computer.
Mcafee
antivirus
Trendmicro Housecall is a popular free online antivirus program that allows the user to download a small file onto their computer, which will then run and check the computer for viruses.
Yes, but I'd feel safer using it with antivirus.
Check this link: http://www.2-viruses.com/remove-antivirus-360 Read the comments section in particular ;)
Some viruses are able to turn protection off. Use another antivirus program to check your computer. If you are sure that everything ok try to uninstall the antivirus and install again. If it didn't help call support if you paid for antivirus. Or it the antivirus is free pick another one.