Hanover, Germany - Most current generation anti-virus programs are greatly improved over their earlier counterparts, experts say.

This applies in particular to their ability to use heuristic methods of recognizing and disarming previously unknown viruses, the Hanover-based computer magazine c't concluded after a test of 10 programs.

Most programs now offer good protection against spyware. Yet, the programs are also increasingly prone to issuing false alarms, such as when they classify newly installed software as malicious.

"It's often impossible for users to determine why the software is crying foul," the magazine says. Manufacturers must provide better documentation on the meaning of the warnings.

The tested programs cost between 30 and 65 dollars. The experts recommend against relying on free software. While free versions of Antivir and AVG used to be sufficient, they now lack certain important functions which must be covered by purchasing additional software. (dpa)