Android : How do I fallback to previous versions of Android Studio

I am having problem with the new update AS 1.1 Beta 2, Android Studio seems to stay as executing task, My always solution is restart(alt+ctr+delete) the IDE and for at least 2 - 3 runs its back again(stays on executing task).

Is there any way that i could fallback to previous version? or should I uninstall and install Android studio?

Thanks