SQL Server 2008 R2 { An Error occured when attaching database(s) }

Hello Guys!

I just installed SQL Server 2008 R2 a couple of days ago, on the first day use i can attach database(.mdf) with out any problem.

on the day 2, i keep getting this error:

http://img515.imageshack.us/img515/14/1212i.png

TITLE: Microsoft SQL Server Management Studio
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An error occurred when attaching the database(s).  Click the hyperlink in the Message column for details.

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BUTTONS:

OK
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after clicking the Hyperlink this window open:

http://img34.imageshack.us/img34/8766/hyperg.png

TITLE: Microsoft SQL Server Management Studio
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Attach database failed for Server 'STARGAZER-PC\SQLSTARMAX'.  (Microsoft.SqlServer.Smo)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=10.50.1600.1+((KJ_RTM).100402-1539+)&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Attach+database+Server&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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Unable to open the physical file "E:\New folder\DataBase.MDF". Operating system error 5: "5(Access is denied.)". (Microsoft SQL Server, Error: 5120)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=10.50.1600&EvtSrc=MSSQLServer&EvtID=5120&LinkId=20476

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BUTTONS:

OK
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in that day i reinstall SQL Server 2008 R2, because I'm so confused. after that i try to attach i still got the same error, what i did is i share the folder where the database is.

i open SSMS and try to attach and i attached without any error...

i think this is the 4rth day, untill now everytime i want to attach a database i got this error, and even i try to share the folder where the database is i still got that error.

any advice guys?

Thanks a lot

jhules