Every time I open up Cashbook a "User Account Control" message appears.

PLEASE NOTE:  if the solution below is done it will reduce the security on your computer,
 as explained in this link: http://windows.microsoft.com/en-au/windows/what-are-user-account-control-settings#1TC=windows-7

If after reading the above link you still wish to turn this message off
please follow the instructions in this link: http://windows.microsoft.com/en-au/windows/turn-user-account-control-on-off#1TC=windows-7