i had blue screen 3 times today and i uninstalled firefox 6.smt. then i've downloaded firefox 7 setup an tried to run it. it starts to extract files but nothing happens. by the way smt weird happens, after extracting files a window shows up and says, "you may not have the necessary permissions to use all the features of the program you are about to run. you may run this program as a different user or continue to run the program as the current user." But there is no other user than me! it also asks for administrator password which does not exist!