Restore Tranaction log

I am trying to restore a Transaction Log in SQL Server 2000 in Full recovery status, However I was received the following error Message:
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Error message: Exclusive access could not be obtained because the database is in use.
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Also I changed the UserAccess database from MULTI_USER to SINGLE_USER, but still do not work and shows the same error message.
Please let me know, if you have any solution for this problem.

Thanks,

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