No. You cannot have two antivirus products from different vendors installed on your computer. The F-Secure Internet Security 2012 product automatically detects and removes your old antivirus and firewall products during the installation. You can also manually remove any other antivirus or firewall products before installing the product.

Which operating systems does F-Secure Internet Security-AntiVirus 2012 supports?
F-Secure Internet Security - AntiVirus 2012 currently supports the following operating systems:
-           Windows XP 32-bit: Home, Professional and Media Center editions. Service Pack 3.
-           Windows Vista 32-bit and 64-bit: All editions, all Service Packs.
-           Windows 7 32-bit and 64-bit: All editions.

Can I install F-Secure Internet Security-AntiVirus on several computers or partitions?
You receive a subscription key with your product. You can install the product with the same subscription key on three computers.