I don't believe that the Reader Library offers that option. You may want to open different user accounts under Win7 for your son and yourself to avoid that issue.
As a very clunky sort of workaround you could simply cut out the reader database and paste it somewhere else as long as you don't use the Library. That's rather uncomfortable and error prone, though.
Additionally you should keep in mind that your son can still access the files themselves, even if the Library were locked.
Different user accounts with different access rights is certainly the way to go.
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