score:0

go to http://www.eclipse.org/downloads/ and download the "eclipse for mobile developers" version. then follow the installation steps for the adt plugin.

score:2

when installing adt through eclipse just make sure you have checked: contact all update sites during install to find required software. that helped me.

also try to update eclipse (help -> check for updates)

score:4

the problem is that you are using windows 7 and in windows 7,by default admin permissions are not available.

so just right click on eclipse icon and choose "run as administrator" and then click on help -> install new software -> then paste url of adt plugin -> click on select all-> next-> finish and it will continue installing


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