Problem With MS Outlook 2007

Hi Everyone,

I am having trouble with MS Outlook and Internet Explorer 8 on my Windows XP, SP3, computer. When I try to send or receive an email, with no other programs running, it fails I get a screen message which states that the outlook.pst file cannot be accessed because another program is using it.

Outlook and Outlook Express are ticked as permitted in my Windows Firewall settings.

Sorry to be a nuisance but I have been trying to solve this problem for two weeks now and not made any progress. I am using Googlechrome in the meantime but Outlook does not seem to work with Googlechrome and I want to use the features in Outlook.

I would be very grateful if someone could advise me as to how to make Outlook work properly again.

Best Wishes,

John