how to delete "the action can't be completed because the file is open in another program" on a windows 7

I have been trying to delete a pdf file on a shared hard drive network. I have tried almost everything posted online regarding this error, but nothing works. The problem is when I try to delete the file this error message pops up: "the action can't be completed because the file is open in another program". And when I click the button "try again" it does the same thing with the same message. Please help!! what should I do?
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jmerullaAsked:
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tailoreddigitalCommented:
I use this tool when this rare situation arises,
http://www.snapfiles.com/get/Unlocker.html
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Fred MarshallPrincipalCommented:
Might it be set up with a shortcut on another computer or just plain open?
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Richard SchilkeOnline Marketing and ITCommented:
Do you file preview visible in windows explorer when trying to delete the file?
If in a server environment, right click on My Computer on the server and navigate to Open file and see what/ whom is locking the file and unlock  the file
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Fred MarshallPrincipalCommented:
Even if it's on on a server, you can go to the computer where the file resides, open Computer/Manage/Shared Folders/Sessions/
There you can review all the sessions which should include any shared accesses at least.
And, you can close those sessions if you want.
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