Not sure if you are using the new magic Start Screen (one with blocks) or are a desktop person. On the Start Screen try typing Internet Explorer and it see if it finds it - may have just gotten shifted, so look around. If this doesn't help and you prefer the modern IE look then pop back and we can try to find a way forward.
If you are a desktop person (like me) then you could press Windows key + X, from the drop-down, select "File Explorer" then open your main drive (usually C). Next go to:
Program Files > Internet Explorer. Right click the file iexplore.exe and create a shortcut. It will tell you you can't put a shortcut there and offer the desktop, which is fine. If you wish you can rename the new desktop icon (right click) just Internet Explorer. It you prefer it can be pinned to the new Start Menu by right clicking it and selecting "Pin to Start".
Not certain on this but the first thing I would do is go here "from Firefox":
Make certain you have the latest flash update. If not use the blue link at the bottom of the paragraph just above the table. Make sure you uncheck any unwanted goodies. Download and Save the file then go to the saved file and double click it to install the Flash add-on.
Always pop back and let us know the outcome - thanks
message edited by Derek