I have installed the program and can run without any problems from the administrator account.
Other Windows XP accounts (non-administrator accounts) on this computer get the Error message: "Access to an unnamed file was denied!" upon quiting the program. Further attempts to start the sudoku program within the same login session fail to display the sudoku program. When loging out the "Access to an unnamed file was denied!" message once more appears and a message may come up saying "stopping sudoku.exe"
A full new login on the same account once again allows a single use of the the sudoku program ending with the same error message upon exiting the program.
Your help would be greatly appreciated.