add this to a reg file Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RemovalTools] "MydoomTool"="OK" [-HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Shell] Then my windows update will no longer prompt for mydoom removal tool. As an inf [Version] signature="$CHICAGO$" [DefaultInstall] AddReg=mydoom.ADDreg DelReg=mydoom.DELREG [Mydoom.AddReg] HKLM,"SOFTWARE\Microsoft\RemovalTools","MydoomTool",0,"OK" [Mydoom.DelReg] HKLM,"Software\Microsoft\Windows\CurrentVersion\Shell"