From http://onguardonline.gov/malware.html
OnGuardOnline.gov provides practical tips from the federal government and the technology industry to help you be on guard against Internet fraud, secure your computer, and protect your personal information.
Malware, is short for "malicious software." This software could include viruses and spyware programs installed without your consent to monitor or control computer actions. These programs are created to steal personal information, send spam, and commit fraud. Websites are created to entice you to click on a link that could download malware. OnGuardOnline.gov says consumers can minimize the havoc malware can cause.
You may be infected if you notice that your computer has significantly slowed down, won't shutdown or restart, or displays a lot of pop-up ads. If you suspect malware is on your computer:
- Stop online activities that involve user names, passwords, or other sensitive information. Your personal information may not be going to where you think it is going.
- Verify that your security software is active and current. Check for anti-virus and anti-spyware software. Once you confirm that your security software is up-to-date, run it to scan your computer for viruses and spyware. Delete everything the program identifies as a problem.
- If you are still experiencing problems, contact your technology consultant.
- To minimize malware infections in the future (1) don't click on a link in email or open an attachment unless you know who sent it and what it is, and (2) don't download and install software unless you know the website and trust it.