The letter "p" is not working anymore

Hello everyone.

I tried to connect my TV to my computer today, without success, anyway...
It seems that during the process, a shortcut was accidentally created.

I realized that after that, the lowercase p key on my keyboard stopped working. Not even on the numeric keypad.

So it seems that this letter has been assigned to a command...
I spent the afternoon trying to figure out how to modify or delete this command... without success.

In the meantime, I'm typing the letter p using the Alt+112 command.

So how can I find and delete this command? Thank you.