It is a big hell when one encounters "Registry editing has been disabled by your administrator"
Infact I was also one of the you who encountered this same problem.
So here is the solution for the problem.
1.Go to Run(CTRL + R) and type " gpedit.msc " as shown in the figure.
2. Now you have to go to this path
Double-click Prevent access to registry editing tools and Set it as Not Configured.
Important: If it's already set to Not Configured, set it to Enabled and click Apply. Then repeat the steps and revert the setting back to Not Configured. This removes the registry based policy if set already.
This is a very simple trick.
1.Go to Run(CTRL + R) and type
"REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableRegistryTools /t REG_DWORD /d 0 /f".
This will eventually enables the Registry editor.Try this.
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