One more quick tip:
As armsys mentioned, always save your entire registry before editing it.
To go one step further, export the specific key you are deleting to a folder in My Documents (In XP; Documents in Vista) that is created and named just for registry edits. Export it with a descriptive name you will remember and make sure it is a ® extension.
That way before restoring your entire registry if you don't like the result of the key deletion, you can just double-click on that exported key and it will be restored back into your registry.
Jim
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