I installed the free version of AVG V6 anti-virus software on my PC many months ago and it has never caused me any problems. Today, howeber, Outlook Express stopped working. When I run OE, it partially starts up, but then the hour glass appears and stays, and my email messages do not appear (including the old ones). I fixed the problem by unticking the 'Use Outlook Express 5 Plugin' on the 'Email Scanner' tab of AVG Control Center. I've left everything else on this tab ticked.
What does the OE5 Plugin do? Actually, I have OE6, not OE5, with Windows XP. How much more vulnerable am I to viruses by unticking the Plugin? Before things stopped working today, I've always found that using the Plugin slows down the display of old emails in other folders when I click on them in the Folder window (eg Inbox, Sent Items), so does it just re-check all the old emails in the folder that I click on for viruses that have been checked before when they were first received?