I use the free version of avast on my windows laptop - i've often wondered whether it was worth paying for the full version - some articles I'd read online indicated that the difference might not be so vast between free and paid versions - but now I'm nervous again...
Given the cost probably isn’t that much, I’d personally go for the upgrade... might only be one little feature that’d make the difference...
I think I might switch to an overall higher rated, but paid anti-virus actually - bunch of articles seem to point to good ole norton or kapersky (spelling) - I'll look into it.