How does Quick Heal Works ?

Viruses can attack the computer by infecting executable files and certain portions of the floppy or hard disk. Quick Heal has scanners that check a file for viruses. Quick Heal has a database of signatures using which it can determine if a file is infected or not. Quick Heal has a Heuristic scanner which also detects unknown viruses! So much for virus detection and removal. Quick Heal's 'On-line Protection' is a Virtual Device Driver (VxD) which Hooks the File System Driver for protecting the system from known viruses. Which traps a virus if a infected file is run. Once loaded the utilities provide protection till the machine is switched off.