Adobe Acrobat 9 Problem - Files Opening on Start

I am running Acrobat 9 on Windows XP. Not always, but most of the time, when I open the program or even if the program is already open and I try to open a file within it, every .pdf that I have worked on in the last two or three weeks will open. This takes forever and ends up freezing my entire system. Force quitting and then restarting the program (and the computer) does not seem to help.

Has anyone else had this problem? Google is not helping me. Should I just uninstall/reinstall the software? Thanks in advance for any help!