It sounds like your virus cleaner or adware software deleted an essential file, "at least essential to that program". You search for that .Dll file by running a search from your start,search, type in that file name, 53 ADDON2VB.DLL, and you may find it in your virus quaranteen folder, or you may have to locate it online by a google search. Hipefully it is still on your machine. If you are running Norton/Symantic, that is not uncomon. You may need to re install the game, and place the reinstalled file on a do not scan list in your virus and spyware programs, there is
http://forum.worldstart.com/archive/index.php/t-38251.htmlmore info on that problem here,