That's very true Chris
Anyway, the window fix worked (Kept the window button pressed for three seconds while it was up, and now it works correctly).
This morning I've also noticed that the radio requires code, however I've the instruction on how to enter it (And the radio code is on the service book. Hopefully it should not be a problem.
About the main issue (the instrument panel), it's not completly dead... I don't have the speedo, the rev counter, the petrol gauge and the computer, but I still have the signal lights, the main lights, fog, rear fog, etc. Plus there are two flashing lights (the yellow engine and the red engine with stop written inside).
Don't know whether this can give you a clue on whether I need to change the whole display or if there are other solution (Such as disconnecting the battery).