I was running a beta build of windows 7, version 7057 anyway when i would be typing the cursor would randomly move backward on the text so i would begin to type over things i already type into. I thought it was just a problem with AIM at first. So i tried it in notepad and word and the same thing happened. I am using a laptop so i thought maybe it was my palm hitting the trackpad to i put a piece of tape over the trackpad to make sure it wasent my hand causing it. Well obviously it continued to happen so i had to revert back to vista. I have been thinking of trying the RC but the time it takes to install all my programs etc etc takes awhile so i am curious if anyone knows why this was happening or if anyone else had this issue.