error هنگام atach کردن برای فلش

[Sadegh agha]

وقتی روی دیتابیس میرم و می خوام atachکنم، پس از addکردن وقتی okمی کنم error زیر ظاهر می شود. لطفا راهنمایی بفرمایید.
TITLE: Microsoft SQL Server Management Studio
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Failed to retrieve data for this request. (Microsoft.SqlServer.Management.Sdk.Sfc)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&LinkId=20476

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ADDITIONAL INFORMATION:

An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)

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CREATE FILE encountered operating system error 32(The process cannot access the file because it is being used by another process.) while attempting to open or create the physical file 'C:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\Hospital.mdf '. (Microsoft SQL Server, Error: 5123)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&ProdVer=11.00.2100&EvtSrc=MSSQLServer&EvtID=5123&LinkId=20476

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BUTTONS:

OK[/]