PDF thumbnails not working!

It was working a few days ago, but now suddenly I don't have thumbnails for

PDF's in windows explorer (vista sp1)

I have all the settings correct to see them as thumbnails since I see jpgs

as thumbnails for example so its not a setting in windows.

I have tried to uninstall and install acrobat 9.0 again and again as

administrator user of course, I have tried making it a default application

for pdfs again and again..

but NO GO!

there is a dll that does this thumbnail extraction called PDFShell.dll...

I even tried to register is from a command line as admin ( by right clicking

on the cmd in the start menu and selecting run as administrator) but I got

the message:

The module "PDFShell.dll" was loaded but the call to DllRegisterServer

failed with the error code 0×80070005

WTF I am admin and I want to register the dll and I cant? This should not be

happening... I took a look at the registry permissions but they seem ok.. as

far as I can see...

I have no idea why this is not working.. this is so frustrating Im thinking

of formatting vista and reinstalling but its just too much work only for

this...

I use pdfs all the time and I want to see them via windows explorer....

any help..? I believe it has something to do with registry permissions, even

though I am an administrator