I have a computer that is 64 bit but currently running windows 7 32bit. I was thinking of buying Windows 7 64bit to try and beef up my CS5 speed. I have always noticed CS4 and now CS5 running slower than I would like and lagging a lot when you get doing too many things. I currently have 4 gigs of ram and a dedicated 512MB vid card, so my only other thoughts are to jump to 64bit. I am curious that if you have made the switch, how big of an improvement did you notice? Is it worth spending the $150 dollars? Thanks.