Thinking of changing computers

[Musicman51]

My old trusty Compaq computer in my studio is starting to show signs of it's age. Our local computer store have a couple on sale been looking at. These have Windows 7 on them, and appear to be 64 bit? I would not be using this computer with hoster. Only Microstudio, Keyrite, and Home producer. Now do i go online to remove these programs, then reinstall on the new computer? what about my registration numbers? Any problems with the 64bit format? any problems with windows 7 and these programs? Are there changes that must be made to the computer like there are for hoster? If so, i will just sink more money into my old studio XP machine and continue using it untill finally it goes out all together...So what are my steps in doing this? George