what's the method to restriting anybody to open ms-excel/word at my pc.


i don't want anybody to sit at my seat n open ms-excel/word to do his job. please tell me any idea except creating a user a/c with passowrd.
let my pc is open to anybody but i only want to restrict opening ms-excel/word.

here, i'm not talking abt to open a particular file, i'm just talking on the whole application not to be opened.

any help would be highly appreciated.
thanx in advance.