Reader X problem - Accept End User License Agreement

I have recently updated to Adobe Reader X.

I use Windows XP (SP3) and Internet Explorer.

Now, when I attempt to read a .pdf file a Reader X message pops up with the following message;

"Before proceeding you must first launch Adobe Acrobat and accept the End User License Agreement".

I do not have Adobe Acrobat, I am using the free Adobe Reader X.

Why am I getting this message and what can I do to stop it so that I can again read .pdf files.

This never happened with the previous version of Adobe Reader.

How can I go back to the previous version?

Thanks

Gryphon2345