i m using pc from last 1.5 yrs.
Last year i used quick heal but many times my pc was infected and quick heal didn't catch those virus.
Now i m using Bit defender from last 3 months and my pc is running fine.
But bit defender takes lots of time for scan.
Don't know about other anti-virus
I am using AVG Free Edition for years. No issues with it. One more thing to note, Mozilla Firefox is my primary browser and I use Internet Explorer only when the web page I am visiting is not supported in Firefox.