Not positive but I remembered people having problems with it. I checked out Microsoft and this is what they said to do.
In Control Panel, open Add or Remove Programs.
In the list of currently installed programs, click Interstitial Ad Delivery by n-CASE or n-CASE.
Click Change/Remove, and then click Yes to remove this n-CASE component.
In the list of currently installed programs, click n-CASE or PAD Lookups by n-CASE.
Click Change/Remove to remove this n-CASE component.
Right-click the Windows taskbar, and then click Task Manager.
On the Processes tab, click any instances of the Msbb.exe process that are still running, and then click End Process.
Search your Windows drive for the Msbb.exe file, and delete it if you find it.
Here's the link if you want to check it out yourself:
http://support.microsoft.com/?kbid=317714