ok i really need help here..

Alright so basically i cant right click with my mouse... as in when i right click on a folder it will highlight the folder but it wont bring down the menu, i cant right click on files also.. but for some strange reason i can right click on pictures when i open them, web pages and almost everything else except my desktop and folder/files..

I did the trouble shooter and it didn't work, i tried unplugging the mouse and putting it back that didn't work either, so this is my last resort... any help will be great thanks