I have looked endlessly on why on earth after installing Windows 7 Home Premium from Vista that now my PC runs slower. Windows has increased trouble handling multiple applications which weren't a problem in Vista. example: I can't play music and surf the web without struggling performance in media player. Boot is considerably slower. Programs load slower. I have a diagnostics report if needed. There always seems to something running in the background. Even when I switch from one window to the other, the mouse stutters. I cleaned up the PC too. Wondering if I should use Advanced System Care to fix my registry? My experience index is down. (I know there's lots of posts on that) But it truly does perform slower. I checked all my drivers, all up to date. I checked my startup. Nothing should really be causing this. I also checked the stickied posts too to identify the problem. I have 64 bit Windows 7 with 4 gbs ram. Core 2 Duo @ 2.4 ghz Thanks for the help.