Office 2003 and 2007
 

I have both office 2003 and 2007 installed n my pc.
Till now all the files were opening in XL2007 by default.
But yesterday, all files started opening in xl2003. I dont know how to
revert back to xl2007 as default excel application. It has happened
after I installed Adobe reader ver9.0

Is there any choice available or tweek which allows us to select the
default application between 2003 and 2007?

Pl help.
Regards,
Ketan