Syc issuewith iPhone with iTunes 11

Hi everyone, recently I updated Itunes (Ver.11.1.5.5) and Iphone IOS (Ver. 7.1) and ever since, I can not sync music and videos to my iPhone if Avast is running. Actually, I already had an issue while updating them, so, to be able to update both, I had to delete Avast completely, then installed it again.

After the update was done, for a few days I was able to sync music and vids normally, but it started not to sync again and I can not figure out why.

I saw some previous forum and some wrote to delete AVG, but I don’t see it in the list of installed programs… :-\

So far, the only way to sync songs and vids to Iphone thru Itunes is to literally cancel Avast, sync, then install again. Obviously I don’t want to keep doing this everytime I sync. Can someone help? :-*

More information is needed.
What OS/SP?
What exact version of avast?
Is/was there any other av on the system?