Locked files on the server

Very peculiar situation
User has a file on the server (PDF file)
logs in from a windows 7 pro machine as a normal user
goes to the network and opens the pdf.  makes changes and tries to save and it says another user has locked it.  When I check the server no user has that file open.  restarted the client machine but no luck.  
I am stumped because it keeps happening on several other files on a random basis.  I was reading about oplocks but dont know if that would change anything.  Please help.
LVL 3
ankur1234Asked:
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jhulbeCommented:
Users need "full control" access to the directory. Because adobe will want to delete the temp file before saving. So just read/write will not work.

Right click on the directory, properties, security tab, select user, and Allow full control to that user, or a user group.

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ankur1234Author Commented:
they have modify permissions on the directory.  Is that not good.
ankur1234Author Commented:
update:
This is exactly what is happening except the client is a windows 7 machine
"File Lock or Access Denied Error Message When You Save Files Over the Network"
http://support.microsoft.com/kb/812937

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Samo_FasteCommented:
Use Sysinternals Process Explorer to find out what's locking the file. Select "Find handle or DLL" and type the filename and you'll find out what's locking the file.
ankur1234Author Commented:
But nothing is locking the file.  If i am on the server as administrator I can move the file, delete the file or even modify the file, but I cannot do the same when I am logged in as the  user from a windows 7 client machine, i mean even if i am logged in as the admin.  The file has full modify permissions for all the domain users.  
ankur1234Author Commented:
This gentleman's comment gave me ideas to try multiple solutions.
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Windows Server 2008

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