Can you try running Eclipse as Admin and try this again?. Let me know how that goes.

what is the update url are you using, is this it m2eclipse.sonatype.org/sites/m2e ?

Edit:

There are incompltibilities with different vertions of Eclipse and plugins,

I suggest you to use the update site

http://download.eclipse.org/technology/m2e/milestones/1.0

OR

http://download.eclipse.org/technology/m2e/releases

The best bet is the release version, But if you are still getting the issue, try the milestone 1.

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