Can not open multiple Adobe PDF Files at same time

I am having trouble with opening multiple .PDF files in Adobe.  Once I have one (1) PDF open, when I try to open another file it opens and then instantly force closes that file, but leaves the original PDF file open.  There are no error notifications or anything - its as if you never tried to open the other file.  In short I can only have one (1) PDF open at a time.  It does not matter whether I try to open the file straight from the directory or whether I go to File -> Open -> find file and Click OK.  The same thing happens either way.
Things I have tried already:
1) Restart Computer (I think this is SOP for computer issues. LOL)
2) Closed all adobe session and end processes (in task manager) for all adobe related processes (that I can identify).
I am running Adobe 9 Professional on Windows XP.  Please let me know if you need any additional information.
I would appreciate any help anyone can provide.  I have tried researching this issue on this and other forums without finding a similar thread/issue.
Thanks!
Mel

Are you using any plugins, like PDFlyer?

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