All I can say is that you had better remove Adobe Reader 9 and install the latest version (Reader X): PDF reader, protected mode | Adobe Reader X
The link above will also tell you what you can do with the program - its main function is to open and read PDF files.
Adobe Reader 9 caused Windows Explorer to crash on my Windows 7 HP computer. In addition, older software versions are vulnerable to malware - they're a security hazard.
Always keep your OS and programs up-to-date :-)