I was following solution at Can't update ADT plugin in Eclipse to version 23.0.0 or above exactly what was said, because I was in the same shoes.
I removed the Android Developer Tools as well, as suggested in the answer, but now I can't even start eclipse getting error of
The eclipse executable launcher was unable to locate its companion shared library.
I searched this problem but their scenario was different from mine. Please help, I've spent hours on this issue.