Hoping someone can help me get this working on IIS.

Here is the location of my executables:

C:\Program Files\MySQL\MySQL Server 5.5\bin\mysqldump.exe
C:\Program Files\MySQL\MySQL Server 5.5\bin\mysql.exe

Here is the error that I get when I try to backup:

Error The backup failed because there was an error starting the backup program (mysqldump or mysqldump.exe).
If running on Windows 2003 server, you may need to alter permissions on cmd.exe to allow Special Access to the Internet Guest Account to read/execute.
You should talk to your webhost about why exec() commands are failing when attempting to run the mysqldump binary/program.
The command being run is: "C:\Program Files\MySQL\MySQL Server 5.5\bin\mysqldump.exe" "--host=localhost" "--user=samplesite" "--password=*****" --opt --complete-insert "--result-file=M:\web\samplesite.com\admin\backups\db_samplesite-20120618174239.sql" samplesite
Warning Result code: -1
Error Failure: The database has NOT been saved.
The server's admin assures me that permissions are correct for the script. The database username is the same as the site's base name (samplesite > samplesite.com). Hope that make sense!

Thanks in advance for any help!