There’s lots of ways to prevent a malware (virus or spyware) infection for free, here’s a list:

1. Remove malware (You can’t prevent something that’s already in your system)
   • Install and run Malwarebytes’ Anti-Malware
   • Try an online anti-virus such as TrendMicro HouseCall or Panda ActiveScan
   • Still got problems? Tools such as HiJackThis and ComboFix are helpful
2. Install free anti-virus software
   • If you are on a business network, contact your IT administrator
   • Make your own choose from a list of antivirus software
     
   • You only need one and so uninstall any others (such as Norton or McAfee)
   • You can download and register Avast! Home which is free for personal use
3. Stop using Internet Explorer
   • Download and Install Mozilla Firefox (free)
4. Updates
   • Check Windows Updates
   • Check your Browser is up to date
   • Check your anti-virus software has the latest definitions
   • Check Adobe Acrobat Reader (or get FoxIt Reader instead)
   • Check Java
   • Check Adobe Flash Player
   • Ask the vendor about updates for any other software that you use regularly that connects to the internet
5. Firewall
   • You should not need any more than Windows Firewall that comes with Windows XP or above, ensure it is enabled
   • If you use a modem (usually connected via USB), it is recommend asking your Internet Service Provider (ISP) to upgrade you to a router (for network or WiFi connection). If you’re not sure, call your ISP and ask
   • If you are using Windows 2000 or below, get Kerio Personal Firewall
   • You can test your firewall using grc.com leaktest or hackerwatch.org probe
6. Block bad sites
   • Use OpenDNS (ask your network administrator)
   • Using your own hosts file (mvps.org hosts or hphosts)
7. Filter your email
   • Make sure your mail provider uses spam filtering software such as SpamAssassin — you may have to ask
   • Consider using Google Mail (Gmail) instead since their spam filter is second to none
   • Ensure your mail is scanned by a virus checker, either by your host or by your computer

Hope this helps!

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