I have a similar issue, and believe it or not, its specifically related to this website. There is a script running that causes the browser to stop responding. After a few minutes i get a prompt informing me that the script is causing the browser to slow down, continue to run the script and the browser may crash. I run windows 7 64 bit. Using mainly IE8 32b since the new Firefox 3.6.3 is causing issues and my Norton toolbar doesn't work with the 64b IE8. Wish I could help solve your problem but I may be in the same boat here as I notice the only process running that seems I can identify is Flash Util 10e, Adobe Flash Player Helper 10.0r45 runs.