For some reason my computer is opening my pdf files in explorer and not in adobe reader even though they are still pdf files.
In fact all my saved pdf files no longer have the adobe reader icon attached but have the explorer icon.
This has only happened from today.
Any advise is greatly appreciated.
You have changed the file association with pdf to Internet Explorer rather than Reader. You need to change it back. The easiest way to do this is to re-install Reader if you do not know how to manually change the file association.