You should provide us with some extra information. It looks like your environment is instable, but I bet you already made that conclusion.
Was there an upgrade in the past which could cause the signature error? In that case, some .dll files need to be replaced or fixed.
Also, verify if there...
In answer to your first question, Google is your friend:
http://technet.microsoft.com/en-us/library/cc287954.aspx
In order to provide you with a suitable answer, we really need more information then "it did not work". So, what did you do, what have you tried, what where the errors or problem...
I agree, it's possible to exclude the administrators to certain (sub)-sites, f.e. a site with confidential data in it.
It's definitely not a best practice, because site administration would then rely on non-administrators and as we all know there will be some point the end-user needs help.
As...
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