You still have a trojan or worm, unfortunately. To access your registry, boot into Safe Mode. This will allow your registry to open and work. Here is the path where most worms/trojans reside ... HKEY_LOCAL_MACHINE / SOFTWARE / Microsoft / Windows / CurrentVersion / Run (double-click on Run). Look for msblast or mslaugh in the right pane. Also, the best blaster worm removal tool is at Norton, I have used it many times repairing computers. While in Run, look the list over and search the interent for anything you do not recognize since there could be other worms or trojans.