It doesnt look like a software problem - it is physical.  We had a problem at the studio with the shutter release button, it had got something in it which was sticky and thus it stopped working properly...  if the button is continuously pressed then it will always do something with the software making you unable to do other things... just think about trying to type with the spacebar continuously depressed and you see what i mean.

Best idea is to try and free the button without using too much force - a pin through the sides of it perhaps to try and lift it?

In the end - if you cant use the camera then use your own judgement as to how far you are willing to go to either fix the problem or mess the camera up more - (i usually go for the former )

"In every colour, there's the light.
In every stone sleeps a crystal.
Remember the Shaman, when he used to say:
Man is the dream of the Dolphin"

Rich Meadows Photography