R-1.2.0 for windows crashes

Can anyone help with the following problem...

I using R-1.2.0 on windows 95, and when I press <SHIFT> and 3 together (ie
the ? symbol - on a uk qwerty keyboard), 
R crashes. This only happens on R and with no other windows apps. Does
anyone know why this happens and what I can do  to stop this happening, as I
have accidentally lost small portions of unsaved work by slip of the key.

Many thanks.

Gary Collins.
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