The setup program changes your local DNS Client/Cache Service to Manual Startup mode, so if the Service was enabled, it will not be started after the reboot. This is done due to the fact that most programs will work better with the local TreeWalk if such a service is not active. Paste the following command into a "Run" box to change the setting only if absolutely necessary:
%systemroot%\system32\services.msc /s
Upon uninstalling TreeWalk DNS that setting is returned to what it previously was anyway, and all original DNS server settings will also be restored to what they were.