I have itunes on my computor but when i try to open it i get an error message and it won't open

i have itunes installed on my computor. i tried to open it last evening and got an error message that told me i needed to reinstall itunes.
when i tried to download itunes i get a message that saysService Apple device (apple mobile Device) failed to start. Verify that you have sufficient
privleges to start system services. what does this mean and how can i reinstall itunes

most likey.Here is the new article apple has on it http://support.apple.com/kb/TS5376

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