Prompted to update to 4,2, but I already have 4.2 ?

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http://forums.androidcentral.com – A couple of weeks ago I was prompted to download and update my Galaxy Nexus to 4.2. I downloaded it but didn't install it...tt says: "Android 4.2 System Update" I haven't installed it yet because in "About Phone" in the settings it says I have already Android Version 4.2 I just wanted to make sure it wasn't spam or a virus. Should I go ahead and let it install? Thanks for any advice! Jimmy (HowTos)