Generally speaking, a virus causes your computer to do things you don't intend it to do.
Some of the more tell-tale signs of an infected computer are:
- Your antivirus program is disabled for no reason and cannot be restarted.
- You cannot install or run an antivirus program on the computer.
- Strange dialog boxes or message boxes appear onscreen.
- Someone tells you that they received an e-mail messages from you containing attached files (especially with .exe, .bat, .scr , and .vbs extensions) that you did not send.
- New unexplained icons appear on the desktop.
- Strange sounds or music play from the speakers.
- A program disappears from the computer.
