You cannot delete CnsMin whilst it is running; if you try to deregister it, it restores all its registry entries immediately. In Windows 95 and 98 you can boot without loaded it must be done by using Start -> Shutdown -> Restart in MS-DOS mode and typing the following commands: cd DOWNLO~1 del cns*.* del 3721\*.* rmdir 3721 exit Then reboot. In Windows NT/2000/XP it is possible to move the files so that they cannot be reloaded. Open the Command prompt (Start -> Programs -> Accessories) and type: cd "%WinDir%\Downloaded Program Files" ren CnsMin.dll CnsDel.dll Reboot and load the Command prompt again. Type: cd "%WinDir%\Downloaded Program Files" del cns*.* (As far as I know, users of Windows Me are screwed - there is no MS-DOS mode and files cannot be renamed. Try to get hold of a DOS boot disc?) The first time you reboot after deleting or moving CnsMin you'll get an error about not being able to find it. Ignore this. To clean up the remaining traces of the software that cause this, open the registry (Start -> Run -> regedit) and delete the following keys: HKEY CLASSES ROOT\CLSID\{B83FC273-3522-4CC6-92EC-75CC86678DA4} HKEY CLASSES ROOT\CLSID\{D157330A-9EF3-49F8-9A67-4141AC41ADD4} HKEY CLASSES ROOT\CnsHelper.CH HKEY CLASSES ROOT\CnsHelper.CH.1 HKEY CLASSES ROOT\CnsMinHK.CnsHook HKEY CLASSES ROOT\CnsMinHK.CnsHook.1 HKEY CURRENT USER\Software\3721 HKEY LOCAL MACHINE\Software\3721 HKEY LOCAL MACHINE\Software\InterChina HKEY LOCAL MACHINE\Software\Microsoft\Internet Explorer\AdvancedOptions\!CNS HKEY LOCAL MACHINE\Software\Microsoft\Internet Explorer\Extensions\{5D73EE86-05F1-49ed-B850-E423120EC338} HKEY LOCAL MACHINE\Software\Microsoft\Internet Explorer\Extensions\{ECF2E268-F28C-48d2-9AB7-8F69C11CCB71} HKEY LOCAL MACHINE\Software\Microsoft\Internet Explorer\Extensions\{FD00D911-7529-4084-9946-A29F1BDF4FE5} HKEY LOCAL MACHINE\Software\Microsoft\Windows\CurrentVersion\Run\CnsMin HKEY LOCAL MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\CnsMin