When clicking on the mozilla firefox shortcut icon on the desktop or start menu Internet Explorer opens instead, also any links you try to open from programs such as messenger also open in Internet Explorer but in the homepage.
This was a tricky problem even reinstalling firefox didnt really solve it and all the shortcuts pointed to the correct path and firefox was my default Internet Browser.
The correct solution was to fix the Windows OS Default File Association types
You can download them here:
I was using Windows Vista so I did all the registry fixes like .exe, .com etc and after logging off and on again all was resloved.