Reply #12: It seems you're not the only one having problems with AVG:

[Earth Bound Misfit]

AVG 2011 Bug Affects Browsing Experience, Could Also Hurt Websites: http://msmvps.com/blogs/donna/archive/2010/10/12/avg-2011-bug-affects-browsing-experience-could-also-hurt-websites.aspx

A serious bug in a component of the new AVG 2011 anti-malware products causes computers to flood websites with unnecessary HTTP requests and in many cases prevents users from properly using their browsers.

At this time the problem is not very well documented, but reports about it, dating back to the end of last month, can be found on various forums and discussion groups around the Web.

It appears that the bug is located in the LinkScanner component, which is found in the entire AVG 2011 product line, including the company's popular free antivirus. <...>


Reports suggest other usability issues as well. For example, users not being able to use certain features on legit websites like YouTube, or the IE7 compatibility mode being broken for IE8 users.

According to a topic on the French AVG support forum, the company is aware of at least some of these problems and is working to resolve them.

http://news.softpedia.com/news/AVG-2011-Bug-Affects-Browsing-Experience-Could-Also-Hurt-Websites-160515.shtml via CoU.

Personally, I would lose the AVG (I stopped using it at version 8.0) and go with any of these, I use Avast on my XP machine & MSE on my Win 7 machine and have used Avira in the past:
Avast: http://www.avast.com/free-antivirus-download
Microsoft Security Essentials: http://www.microsoft.com/Security_Essentials/
Avira: http://www.avira.com/en/avira-free-antivirus

If you're going to uninstall AVG, I recommend using the AVG removal tool: http://www.avg.com/us-en/download-tools