I recently upgraded to Bit Defender Total Security 2011. I installed it on my laptop running Windows 7 (64-bit). I noticed several abnormal conditions over a short time.
First, after about 3 1/2 to 4 hours my computer would slow down with 100% CPU utilization. I couldn't move a mouse curser or open windows, etc. The hold system came to an almost standstill. I had to reboot in order to regain any system response. Then, CPU utilization would return to a normal 10% to 30% range. However, after 3 1/2 to 4 hours my computer would slow down again with a 100% CPU utilization rate. I have an Intel Quad Core i7 CPU and all 8 cores were at 100%!
Second, periodically when opening trusted web sites that I normally visited (listed in My favorites), Bit Defender would stop the web site loading and say that the web site was prone to computer viruses, malware, etc. and was blocking the launch of the web site. Only repeated clicking on the web site's URL could I eventually launch the web site. This might happen with the same web site repeadily or it might happen only once with a particular web site and then do the same thing with another web site. There was no pattern here. I am running IE 8 (64-bit) as part of MS Office 2010 (64-bit).
I've used Bit Defender under Windows XP Professional with no problems. However, as soon as I upgraded to Windows 7 (64-bit), I started getting strange performance issues.
How do I know it was probably Bit Defender that was "acting up"? I uninstalled the program and temporarily replaced my needed anti-virus protection with Microsoft Security Essentials (current version). Performance problems disappeared! I'm not against Bit Defender, but I need a product that will work in a 64-bit environment. Your current 2011 product seems to have issues here.
