Hi there, this is the first time I post a topic here, but I'm totally desperated, and this is my last chance to solve this problem, let's see... (sorry for my english, hope u can understand all, as I'm spanish)

Ok, I was working on Photoshop, I'm always using Command "Control+T" for free transform, but suddenly it has stopped working. I am not able to see the box you see around the object when you press it.

I have looked on Edit > Keyboard Shortcuts, but it doesn't allow me to change anything there either...
I have tried to look through Internet to find a way to solve this, but after trying a lot of things, I have no results.

I have installed another PHotoshop version (I was using PSCS6 portable, and I tried installing Photoshop CS8) but I have the same problem.
I have downloaded a .KYS (Keyboard Shortcurts) file too, but there are no changes...

I'm desperated, can anyone tell me what can I do, please??? Thank you soooooo much, I really need to make that shortcut work :(