Well, if you already know the name of the file in
question and presumably its location (search can help
here) - try unregistering the DLL's from within the
command prompt - start run cmd - the command is -
Regsvr32 /u "Path to the file in question"
ie C:\Windows\System32\Shell64.dll.
See knowledge base article 822206 by going to this link -
http://support.microsoft.com/default.aspx?scid=kb;en-
us;822206
Now, if you need to turn it back on for any reason
just type in:" regsvr32 filename.dll " without the
quotation marks.
Hope this helped!
Also I just recently read this in a KB article:
"To view the functions in a .dll file, use the Dependency
Walker utility (Depends.exe), which is available with
Windows XP Support Tools. To install Windows XP Support
Tools, insert your Windows XP CD-ROM in the CD-ROM or DVD-
ROM drive, click Start, click Run, type CD-ROM_or_DVD-
ROM_Drive_Letter:\Support\Tools\Setup.exe in the Open
box, and then press ENTER."
In short, there MAY be some tool available to you on the
PRO disk - if you have one or have access to one

Cheers