I googled about this topic and found few non-workable work around on error "you must have write privileges in the registry for this device in order to modify the device's advanced setting" when changing advance setting under port in device manager in XP Pro.
I have followed some blog like booting on safe mode on administrator account, changing registry {0000, 0001 , etc} to disable deny on all to no avail.
a precise and workable tweaks for this will eventually help me and others
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That is "as designed". Safe mode should not allow you to modify the registry.
There is a tool called CCleaner that will manage your registry for you by identifying and removing obsolete entries. It is a free tool and very good. The only thing that I would caution is that you should make a backup when prompted to do so and retain it until after a successful reboot. You also need to run the tool recursively until it can't find anything else.
I can't believe all the crap responses i just read here. This, not surprisingly, is a permissions problem. so, Run Regedt32.exe, find HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum now right click Enum , and goto permissions..make sure either Everyone or your account are set to Full
Thanks much to the last response that suggested changing the permissions to ENUM in the registry to full for EVERYONE.
That worked well and now allows me to change the COM port number on my USB to SERIAL adapter. Now I can connect to my Point Of Sale terminals to complete my programming using my newer laptop and can retire my old broken-down laptop with the built-in serial port.
I was having the same problem as the original requester and had to wade through 40 responses to get one that worked. Much appreciated.
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gain back write registry privileges to be able to change port setting
I have followed some blog like booting on safe mode on administrator account, changing registry {0000, 0001 , etc} to disable deny on all to no avail.
a precise and workable tweaks for this will eventually help me and others