Toad for Oracle Xpert 11.6.1.6 - Upgrade Issues

Today I updated my Toad for Oracle Xpert to 11.6.1.6 and without warning it rebooted my MS Windows 7 computer, attempted to restart all of my active programs at the time of the reboot and I ended up being locked out of my MS Active Directory environment. This seemed very odd to me and would like to know how this behavior can be avoided before I have the rest of my team perform the same upgrade.

Thanks,

Jim M