you must have write privileges in the registry for this device in order to modify the device's advanced settings

I'm having an issue getting permissions to modify advanced settings for Com1. From the administrative account, I go to Device Manager -> Ports (COM & LPT) -> Communications Port (COM1) -> Port Settings -> Advanced and when I click advanced I get the error message "you must have write privileges in the registry for this device in order to modify the device's advanced settings". I'm running Windows XP SP2 and i'm logged in with the administrator account.
Please help!
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common issue with com potr, disable your anti virus solution and try again
if that doesnt work yu may need to repermission some reg keys but shoudlnt be that take a look here

Try granting full rights to this subkey, for your user....

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BTW, should be a standard key name, but to verify, the DeviceDesc value is "Communications Port"

ciphronAuthor Commented:
slam, i tried that and it still didn't work

john, your solution worked great!

Thank you both for your help
FYI, I found this using Process Monitor from Sysinternals. It would be a good thing for you to familiarize yourself with thier apps. It can make your life so much easier.....   :)

Glad youre fixed though...  :)
just to cement that from john its a really good piece of investigative kit to find out whats involved with each internal process
ciphronAuthor Commented:
i've just downloaded it and i'm a bit lost - how did you find out which key was associated with trying to change the COM1 settings?

In  this case we were looking for permissions, so we set the filter to include a result, which was Access Denied. Then we went to try and reproduce it.....

In my case, I knew I was working for a registry value, so I used the Operation, is , RegSetValue. That way it only showed processes that were writing reg values. Since it was from teh device manager, it was rundll32.exe.....

You just need to play with them, and use the help feature.....
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Windows XP

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