The easier way
To enable the regedit, just download this little software from here, by comGenius, that will enable your registry within seconds. You just open the software select "Enable regedit(Registry Editing)" from the drop down menu, press perform and Proceed restart and you are done.
The second way
From Group Policy Editor
Go to Run –> gpedit.msc
In the left hand menu, go to User Config –> Administrative Templated –> System.
Now In the right hand pane, select “Prevent access to registry editing tools”. It will probably be not configured or enabled. If it’s enabled, disable it and if it’s not configured, first enable it, apply settings and then disable it. Most probably the settings have been applied instantly. If not, then run gpupdate in command prompt to apply the group policies.
The third way
Go to Start –> Run, copy and paste the follow in the Run box and press OK.
REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableRegistryTools /t REG_DWORD /d 0 /f
The effects are usually instant. If not then you should see the results after restarting your computer.

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Google toolbar, the toolbar from google, like most other Google products has this feature of auto-updating. The irritation when after it updates and show pop-ups like that of Auto-fill when FireFox starts up, especially on my 256MB RAM is disgusting. There isn't still a solution for this. Even if you end the GoogleUpdate.exe from the Windows task manager it will again start on its own in a couple of seconds. And like always Google has a reply for this as well: