App preventing taltalk outlook 2010 files opening

When I try to open my talktalk outlook I get an error message that says "......net.pst is in use and cannot be accessed. Close any application that is using this file then try again. You may have to restart your computer."
This has been happening more regularly and is now permanently stopping me accessing talktalk outlook. I am using windows 8.
I would like to talk to a person if this is not an absolutely simple fix 

They may be able to help you here.
http://community.talktalk.co.uk/t5/My-email/bd-p/myemail
http://answers.microsoft.com/en-us/outlook_com/forum/oemail?tab=Threads
http://answers.microsoft.com/en-us/office/forum/outlook?tab=Threads
Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows]
Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

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