I just updated to the latest version 7.0.1426.
After the update I had a problem with Microsoft Outlook 2007. After closing Outlook, it would automatically reopen, then on closing it again, I would get a message saying that outlook was trying to save my data.
After investigating what may have caused this problem, I discovered that the Avast update actually installed a Com plugin called Avast antispam. I solved my problem by logging on to the computer under the administrator account in safe mode, then opening Outlook and going to the tools menu, and then to the trust centre entry, and clicking on the addins entry in the left pane, then clicking on the go button next to the com addins field. Once there, I unchecked the Avast antispam plugin item, clicked OK and closed outlook. I then restarted the computer in normal mode, logged on as the limited user that had the outlook profile setup. I discovered that the problem was now solved.