remove these entries
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = file:///C:/Documents%20and%20Settings/dk/Desktop/Research/Education-Research%20D esign/Ad_Server_Solutions_affordable_ad_server_managemen t_software.htm
O2 - BHO: SpywareBlock Class - {0A87E45F-537A-40B4-B812-E2544C21A09F} - C:\Program Files\SpyCatcher 2006\SCActiveBlock.dll (file missing)