Antivirus software query

[Epicene501]

What is the best antivirus software? I currently have Norton Antivirus as provided by my isp. My pc has slowed down a lot recently and I'm wondering if this has anything to do with it. Any help would be appreciated.

 

[kimsland]

I say Yes. Norton Antivirus can slow down the best of machines

Recommended Free Anti Virus:
Avira Free
Avast Free

 

[Epicene501]

I'll give Avast a try. Thanks