Is it possible to have a checkbox dialogue with some of the check boxes disabled?

My scenario is as follows:

Which languages do you wish to have available?

x English
x Spanish
x French
x Dutch
x Swedish

I would like English to be checked and disabled (as it is always available because of the way the program is written). I believe I can check it by initialising the variable which stores the results, but it would be nice also to disable it.

(If I can't do it, I can miss English off the list and state in the text that it is always available, but it would be slightly more egalitarian to do it with the list.)

Dave