I'm using Windows 7 Ultimate and I'm having a lot of problems browsing the Internet. I'm having the same problems with both Firefox and Chrome. Here are some of the problems I've been having: browsers frequently freeze and say "Not Responding" at the top for a few seconds or minutes, Gmail says "there seems to be a problem" on the left hand size and email won't load unless the page is reloaded a few times, Flash frequently crashes, streaming videos play slow, I often get a box appear saying "Page(s) Unresponsive" and asking whether I want to kill the page or wait.
I've tried everything I can think of like reinstalling Flash, reinstalling the browsers, disabling Extensions/Add-ons and using the tools in TuneUp Utilities. Please can someone suggest what I can do to improve the performance of the browsers on my computer?