Looking at the date of the first post, this is an old issue. Is there a reason it's not resolved? I just had the same problem on a fresh install, and it insists on interfering with installation through excepted paths. I got ticked and fully disabled avast shields so it would quit breaking my crap. Avast interfering with programs that are fine, blocking exceptions, not being able to restore a deleted file, and all the intrusive crap it does recently is becoming too much. Hit the point where i'm tempted to start looking for a new AV.