Q: new itunes update fails.  Error at mobile device services.  Update was run as Administrator still failed

Hello there, Lettherebelight.

iTunes uninstal/reinstall can be a very tricky venture and has to be done in a particular way. The following Knowledge Base article provides some great in-depth instruction on how to troubleshoot your issue:

Issues installing iTunes or QuickTime for Windows

http://support.apple.com/kb/ht1926

Thanks for reaching out to Apple Support Communities.

Cheers,

Pedro.