Expert: Carolyn Meinel - 6/27/2010

Question
why i can not install antivirus in my computer..?
or my computer can not accept any antivirus software..why?

Answer
This means your computer is infected with one or more viruses (or other malware) that are designed to prevent installation of the antivirus programs you have tried.

However, it is impossible for the bad guys to create a virus or other malware that can prevent you from installing every single antivirus program in the world. The trick is to find one that can be installed without spending a ton of money on new antivirus programs.

There are two excellent computer security programs that allow free trials and that might be able to solve your problem.

1) Download either Kapersky Internet Security, which offers a free 30 day trial at http://kapersky.com or F-Secure's Complete Internet security suite, which offers a free thirty day trial: https://store.f-secure.com/cgi-bin/dlreg/ml=EN?ID=FSISTB&desid=TRIAL

2) Disconnect from the Internet.

3) Install one of these Internet Security products. Scan your system and follow any instructions it might give you.

4) Connect to the Internet and download any updates available.

5) Run another complete scan of your computer. Follow any instructions it might give you.

6) Reboot.

If this works, you can either keep your new Internet Security product or uninstall it and install one of your old antivirus programs that you hadn't been able to install before. Be sure to install any old antivirus product from either a download of the latest version from their website (if that's how they sell it) or from the disk it was on when you bought it. This is important to keep your computer from being infected by a virus that might hide in the old antivirus program if it was stored on your hard drive. Be sure to get all the latest updates right away. Usually antivirus companies are pretty good about updating their programs whenever some new attack becomes able to evade or cripple their product.

If you weren't running an antivirus program that includes antispyware protection and a firewall, then I recommend that you not reinstall your old program. Nowadays we need total protection, and this includes antispyware and a firewall.

8) To prevent future infections, don't use Internet Explorer, as it is susceptible to introducing viruses, adware and spyware into your computer. Instead you could use Chrome, free from http://www.google.com/chrome Instead of using Outlook for email, you could use Thunderbird, free from Mozilla.org, or Eudora, free from Eudora.com .