I have been running Windows Vista 32Bit for about a year I believe, been quite awhile at least. I haven't really had any issues with it and love it. All the programs I use and games don't have issue running. I am happy. For the past month or more I have started to notice tiny little issues, certain programs acting funny, vista just doing weird things. And I am pretty sure it's just this install getting old and messed up. So I have Windows Vista Ultimate 64Bit on hand (well both 32 and 64) and have been planning on updating to 64Bit when the chance came around, so now it has. How much different is the 64Bit version? How many of my programs won't run or even be able to install? How many games will have issue, drivers available and issues? Anything else I should know before doing this update? And currently (not for long) I have 4GB of RAM, will going from 4GB of RAM on a 32bit version to a 64bit version make a difference? Will I notice anything, I doubt it right?