I'd like to disable popup blocker for internet zone after sp2 update. I've tried registry key according to the following document: I don't understand why they are two keys for the same option : HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3\1809 HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3\1809 It seems that only the second key works but in this case I need to update all the profiles present on the computer. Is there an easiest way to disable the popup blocker