|You stopped the update while it was still installing and that can be bad. Many of the larger updates do not fully install until after you restart. They take a few minutes and usually when they report that the update reached 30% they restart. After they start they need to continue this update and that can take some minutes to complete, they usually report the % and warn you not to turn it off while updating.|
You need to do a system restore to the one immediately before the update began (system restore always makes a restore point at this point - as long as it is on). This will effectively return the computer to the state before you ran the update. When you have the time, you should probably run a manual Windows Update to get the required updates.
You have to be a little bit crazy to keep you from going insane.