ITunes reinstallation brings ''error 7 - Windows error 126'

I had to de-install and re-install iTunes (version 11.1.4 64bit) on Windows-8.1. At the end of the installation  process I got the message: "Service 'Apple mobile device' could not be started. Please check wheather you have sufficient authorization to start the system-services" (translated from German). This came though I was logged on as Systems Administrator. When I started the Task-Manager as Systems Administrator and tried to start 'Apple mobile device' I got the message "the service does not respond in time tot he start or control request. Error 1053)"
If I ignore the message above and try o start iTunes I get immediately "iTunes was not installed correctly. Please reinstall iTunes. Error 7 (Windows error 126)". This happens whenever I de- and re-install iTunes.
Could you please help.
Thanks in advance
Hans M.

I'm happy to tell you that "Removing and reinstalling iTunes and other software components for Windows Vista, Windows 7, or Windows 8",
http://support.apple.com/kb/ht1923 solved my problem.
Great many thanks to whoever created this procedure!
There is one additional remark though: In order to remove the specified folders you have to be logged on as Administrator, knowing the Administrator's password is not sufficient. Anyway, I'm tremendously grateful to you supporters!
Hans M. 

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