I get this error while installing the previous version.
An error occurred while uninstalling session context was:(profile=profile, phase=org.eclipse.equinox.internal.p2.engine.phases.Uninstall, operand=[R]org.eclipse.rcp.configuration_root.win32.win32.x86 1.0.0.I20120608-1200 --> null, action=org.eclipse.equinox.internal.p2.touchpoint.natives.actions.CleanupzipAction).
Backup of file D:\ADT\android\adt-bundle-windows-x86-20130219\eclipse\eclipse.exe failed. Can not remove : D:\ADT\android\adt-bundle-windows-x86-20130219\eclipse\eclipse.exe
None of the answers provided related to this issue solved my problem. Eventually, I downloaded latest Android Studio and installed it. So far, extremely happy with its performance and features. I would recommend to install Android Studio.