What are you trying to do?
... try tapping <F8> <key> at bootup select "safe mode" you can access system restore through the "pop up" ... system restore may work better from "safe mode" sometimes not!
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Demonstrative exspelling
... there is logic to this madness!
http://img132.imageshack.us/img132/...
Grrrrrrrrrrrrrrrrrrrrrrrrrrr... .im