I have ran into a curious error when trying to update Android SDK Tools to revision 21 from revision 20.0.3. The ADT plug-in updated properly so now I am at a stand still until resolved.
The initial error I got listed cmd.exe & java.exe as locking the directory, I forced closed cmd.exe and got this:

If I force close java.exe then obviously my SDK Manager closes.
SDK Manager Log:

This is my work computer so I‘d really like to avoid any down-time resulting from a reboot, just curious if anyone has come across this issue and been able to resolve.
I have tried closing Eclispe and running SDK Manager from the file directory, same issue, I read that someone had experienced this while having the directory opened so I closed and still, same issue. Any help is appreciated.
Eclipse:
Version: 3.7.2
Build id: M20120208-0800
Update:
Fresh reboot did NOT resolve.
Copy android.bat and its required libs to a temp dir. This avoids locking the tool dir in case the user is trying to update it.The Android tools are terrible. :( – NateS May 11 ‘13 at 19:29