Answer :

paras
trojans, worms, viruses, spyware, adware are all separate entities and those are the these are some viruses found in pc 
and some famous antivirus are 
Kaspersky
K7
Avasta
and Avira.
shivam2000
anti-viruses==avast,quick heel,k7, avg , comodo , clam , sophos etc
viruses=====macro , boot sector , file viruses , resident viruses

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