'Adobe Flash Player 11.7 r700 has stopped working'

Hello

I am using Windows 32 bit and normally use Firefox, sometimes Windows explorer. Just in the last three weeks,  Adobe Flash Player has not been working, except strangely on two or three occasions.

I get the following message:

(Adobe Flash Player11.7 r700 has stopped working. A problem caused the program to stop working correctly. Windows will close the program and notify you if a solution

is available,) and then it crashes.

Up until about three weeks ago it has been working OK.

Any help would be much appreciated.

Bob

Australia