a) What EditionVersion of Windows 7 Operating System are you running on the computer? What is the system type? 32 bit or 64bit
If you are running 64 bit Windows 7 Operating System, you may want to install 64 bit Game program on your computer.
b) What version of castle of the Winds game are you running on the computer?
I would like to clarify, if you are attempting to install the program or trying to run it.
Step 1: Put the computer in clean boot and then try to run the game
Follow Step 1 in the link below,
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7
http://support.microsoft.com/kb/929135
Important: - Remember to put the computer back to normal startup follow step 7 in the link.
You may consider reinstallation the right version of the game program for your computer.
Make older programs run in this version of Windows
http://windows.microsoft.com/en-us/windows7/make-older-programs-run-in-this-version-of-windows
Thanks and Regards:
Ajay K