I have on my netbook with Win 7 and Avastt 5. I’m not sure it is the Windows 7 itself or Avast. My other Windows 7 machine runs perfect with Avast 5.
I am having the same problems with video and audio , I installed yesterday , any idea how to fix this.
And it doesn’t matter if I turn the shields off ,everything audio or video is still not right… I sure hope downloading this Program that is suppose to help didn’t muff my system up permenetly
I had the problem as well.
Like someone else mentioned it had to do with the shields, so I disabled every shield one by one to see which one was the cause.
It turns out it was the behavioral shield. So I just disabled it permanently and the problem was solved. If there is anyway to “fix” this on the avast developpers’ end it’d be nice unless that’s how it’s intended to work.
By the way it also makes the cursor stutter a lot, like it’s not responsive anymore or the cpu is overwhelmed which it’s not.
Edit: According to Gopher John, things are fixed with the latest update after a reboot (very important) thread: http://forum.avast.com/index.php?topic=54229.0
Hi! I’ve also been having this problem on two different laptops, both Toshiba Satellites! One was a Windows Vista Home Premium whose HDD finally died after the stuttering got really bad and this one running Windows 7 Home Premium. The only constant between both is that I had Avast 4.8 on them. I would hate to think Avast would cause such problems, up to and including the death of a laptop’s hard drive.
I love Avast and don’t want to change antivirus programs. However, I plan to run Unreal Tournament 2004 on this laptop in the next few months and don’t want Avast to cause stuttering in my game.
The poster before me mentioned disabling a “behavioral shield”. Which one is that? The services I have listed are: Internet Mail, Instant Messaging, Network Shield, Outlook/Exchange, P2P Shield, Standard Shield, Web Shield.
Also, someone mentioned adding YouTube’s URL to a whitelist of sites not to check. Why would this be a bad idea? YouTube is just a video site.
Thanks.
Hi OmegaWolf,
The version of Avast that has the Behavior Shield is 5.0 
I ended up putting the FLV extension in the MIME type extensions. There’s something with how the Web Sheild or various other shields behave with that kind of content for some reason.
Anyway, I hope that answers your question. I don’t know why that would be happening with Avast 4.8 ???
I wish I knew too. It’s quite noisome. On my old computer, these stutters turned into freezeups and BSODs. I would hate to think Avast was the cause.
Can filetype exceptions be added in 4.8? I looked in Exceptions in Setup, but all it talks about adding are these things called masks.