Here Are The Most Common Signs of a Computer Virus
1. Spyware or virus scanners present that you did not install but appear to be scanning anyway
2. Emails that are automatically sent from your account that you did not send yourself.
3. Extra popup windows appear when browsing
4. Computer is slow, especially when browsing
If you encountered any of these signs, have your computer checked soon. It's usually a lot quicker to clean up a recent virus than one that has been spreading over time.