How can I avoid firefox resetting my browser preferences when my antivirus software scans my computer

Starting on 2/19/2013 each time my antivirus software scans my computer (Daily), various Firefox browser preferences are being reset. (It appears Firefox may be being reset to default.) My home page is being reset to mozilla etc...
I have reset Firefox, un-installed and re-installed Firefox to no avail.
Each time the computer is scanned my browser preferences are lost.
The system info follows:
Windows 7 pro 64 bit
AVG antivirus 2013 current build.
Firefox v19.

I've got the exact same problem. Even got the same error message as esmer when viewing the prefs script. Seems to happen every morning after AVG runs my daily scan. I hate having to redo everything each morning (been happening for a couple of days now). I'd hate to have to stop using either programs.

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How can I avoid firefox resetting my browser preferences when my antivirus software scans my computer

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