I agree with Mr. Nerney; it should be fine. If you run two anit-virus programs simultaneously, you are likely to get conflicts, but since Windows Defender is really anti-spyware, there shouldn't be a problem. I personally don't use avast! so I can't swear to it 100% though!
Answer
I agree with Mr. Nerney; it should be fine. If you run two anit-virus programs simultaneously, you are likely to get conflicts, but since Windows Defender is really anti-spyware, there shouldn't be a problem. I personally don't use avast! so I can't swear to it 100% though!