As said, I can't click anything because it's all off screen.
http://imgur.com/9i6yv,JtOGs

and i can't change to window mode because i get this message which i dont understand every time i try to!
http://imgur.com/9i6yv,JtOGs#1

Press your O key. Your options should come up. Click the down arrow next to tab that says your number of bits. Then select the last number on the list and select apply and it should be fixed. Thank user if I helped. :)

Nope doesn't work, I can't get in game.

Look at the screenshots i've posted that's as far as i can get.

Go into your control panel and change the screen resolution to the smallest size. You should be able to see the menu and then you can change your client. Once you change your client, go back to control panel and your screen resolution.

It doesn't work either :(

Does anyone know how i can access the SystemEnv.txt (text file) because i know i can manually change the resolution with a code in there, but everytime i try to i get a "Access is denied" error !