Application access blocking program

Hi, I'm looking for a program that will block the ability to run a certain program between 13:00 - 19:00 and 01:30 - 07:00 (GMT+1). It is important that the time is not the same as the computer's time, but from an external source (i.e. you shouldn't be able to use the program by changing the time in the OS.) If it's not much more costly, then I'd like these numbers not be hard coded into the program. Instead the user should be able to change them. The following tasks should require a password: * Changing the numbers. * Uninstalling the program. You should not be able to delete the program in any other way than un-installing it. The program should be turned on automatically when Windows Vista OS starts. There should be no possibility to change this! If the application to be blocked is re-installed/the executable files are renamed etc. the blocking should STILL be working. To summarize; if you don't have the password, you shouldn't be able to use the program between certain times of the day. Your choice of programming language is not a big matter. Java would be nice, for example. I will want to have both the executables for the program + the source code. Contact for more specific information. /Best Regards