How exactly are you printing? If you click the print icon and select the
"Adobe PDF" printer you will get a message stating that Internet Explorer is
trying to launch an external program. After that warning you can place the
printout anywhere you want.
I do not have it installed, but I presume Adobe still has a bunch of toolbar
add-on stuff for IE? If that is what you are using those run within process
in IE Protected Mode, and they would not have the ability to write to most of
the file system. This is a core security feature of IE in Vista which
prevents rogue web pages from reading and writing files outside a little
sandbox that consists mostly of the Temporary Internet Files. It is correct
that if you disable UAC you also lose IE Protected Mode, and any web page
that manages to run programs on your computer will be doing so with the full
privileges of your user account, exactly the way it worked in Windows XP.
That means they can place files anywhere on your computer, and, of course,
read any files they want and send them to criminals.
Hope this helps.
Your question may already be answered in Windows Vista Security:
> When I try to print a web site image to an Adobe PDF file, Vista states that
> for security purposes the pdf file will be placed in a "virtual" temporary
> internet file folder, then opens the virtual folder on C drive, but then
> doesn't save the file in the folder. I've been able to work around the
> problem by disabling all user account control security, but there has to be
> an easier way. I'd like to save files without security forcing them to a
> specific folder. Ideas? Thanks.