This one is really weird. I had a perfectly working Eclipse + Android 2.2 SDK working in both Administrator account and LUA (Limited User Account) unde
Workaround found: Run Eclipse as Administrator (Right-click exe/shortcut, then select "Run as...", then enter Administrator's password).
This is a workaround, not a solution, but it does allow me to continue working while logged in LUA.
Thanks to @David who suggested this solution here: Android ADT Plugin doesn't show up in Eclipse
Update: Solution found:
That's it. No need to run Eclipse via "Run as". Also eliminates the need for a fresh install (which takes more time).