Which type of virus inserts unwanted text into documents and reduce the functionality of the computer?

Which is the most commonly used antivirus software?

Worm is one of the common computer 

Which anti -virus is used to remove trojan horse,worms,viruses etc?

What type of virus resides in the RAM?

Which type of virus affects the boot sector of a floppy or hard disk?

Which type of scan is used to scans a file,drive or entire computer at any time?

Which application program detects and removes viruses from your system?

Which type of virus enters the computer through a network like internet while downloading or surfing various websites?

_____________ connects symantec anti virus automatically to a special symantec website.