If you are attempting to use the 64bit version of Rapture please make sure that you install the Rapture 1.2.1 update. You can download the update here.

If you are attempting to run Dimension Pro on x64, please read these 2 articles:

http://www.cakewalk.com/support/kb/kb20080922.asp

http://www.cakewalk.com/Support/kb/kb20081008.asp