Is your OS 64-bit?
1. Right-click on the setup file
2. Go to Properties | click the Compatibility tab
3. Check the box Run in Compatibility Mode and Run this Program as
Administrator. Leaving Windows XP (SP3) selected.
Do this for the installer and Music Creator icon.
Hopefully this workaround will let you install and run Music Creator 4
on Windows 7 without issues.
MC 5/ Win 7 64-bit link:
http://www.cakewalk.com/Support/kb/reader.aspx/20091014 "What Cakewalk programs can I install under a 64 bit Operating System?
Any application that is specifically supported under Vista or Windows 7, has also been approved to function under Vista x64 or Windows 7 x64 (in 32-bit emulation mode). This means that if an application such as: Guitar Track Pro 4, Music Creator 5, or SONAR Home Studio 7 does not list 64-bit OS support on the packaging or system requirements, this is only referring to native 64-bit support. Unlike SONAR, the aforementioned programs contain only 32-bit versions of the program, whereas SONAR contains separate 32-bit and 64-bit applications on the disc.
If you are running a 32 bit program under an x64 Operating System you should expect it to work just as well as running under a 32-bit OS; however, you will not see the same benefits as a SONAR x64 user, such as increased RAM utilization. 32-bit applications are still limited to accessing 2-3GB of RAM even in a 64-bit environment."