.pdf file extension in windows vista x64

Use vista ultimate x64. Just installed Adobe CS4 master suite. All fil
extensions work fine with associated program (ie: .psd for photosho
...) except pdf file.
Double click pdf files, program won't open at all.
Try to set default file (from windows explorer and from control panel)
no effect.

Have tried unassociate.exe as posted in here:
http://www.winhelponline.com/articles/105/1/
and repair adobe reader installation as instructed.
Still can't do anything.

Any help, please

--
SeamanV

Hi all,

Never mind my stupid question. I just found out what happened.
When I install Adobe CS4 master suite, it install Adobe acrobat Pro
not Adobe acrobat reader. Now, I just install Adobe acrobat reader 9.
and everything work fine.

Just another shortcoming of mine. Sorry

--
SeamanV