Well, since the other post was getting large I changed.
Piatq, to answer your question. Gpedit.msc is just your interface to the group policy. All group policy (local or Domain) are registry entries. Not all registry entries are group policies.
I never tried adding a button to IE. I would never try either unless just for fun. You want to avoid policies that "tatoo" the registry.
I just created an entry on my to test it, but I have to reboot the system and it takes quite some time.
The values are stored for that in the registry @ My Computer\HK_USERS\<userhash>\Software\Microsoft\Internet Explorer\Extensions\<hash for the extension>
Because of the location this is a "tatoo" policy, meaning you need another policy to take it out, thought removig took it out automatically. For policies not to tatoo the registry they have to be located on My Computer\HK_LM\Software\Policies. Tatooing might not be that of an issue in local PCs, but remember that losing the policy won't put things back to normal.
Knowing this, I would suggest first to try and find the place in the registry that the key is saved for you. Then remove it from the group policy. refresh regedit, and see if it removed it. If it didn't, remove it manually (backup first)
Reebot.
You might want to try first and run a resultant set of policies to see if there is anything wrong.
Also, policies are text files. If the policy was aplied before SP2, it might be different. Service Packs usually update the policies set. Also try this tool which is better for group policy
http://www.microsoft.com/windowsserv...c/default.mspx
I haven't used it for local accounts thought. I use it to manage the domain account, and I so like it so much
If you can get it to run use the planing mode (called modeling) to see what changes the policy makes without actually aplying it.
Direct download http://www.microsoft.com/downloads/d...displaylang=en.
I guess you could try to restore the original policy setting. Policies files end with .pol. I tr this.
If you still have problem please post, and I wil run some test tomorrow at home.