Outlook 2003 hangs when browsing to file to attach in an email

When I am in Outlook 2003 and go to attach a file into an email, when you hit the paper clip(insert file),and then hit the drop down to navigate to where the file is, Outlook hangs for about a minute and then recovers, but at each folder level it hangs again.  It will say on the Outlook title bar, Outlook (not responding). It has service pack 1 installed. I have run a repair and I have also uninstalled/reinstalled Office.
Does anyone know what is causing this? Any suggestions are very much appreciated!
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What the outlook.pst file that is in your outlook 2003 created in outlook 2003 or previous version ?

Can you temporarily turn off anti-virus , firewall and any anti-spam software in your machine and check if that would help.

Do you have any add-in installed in outlook and if yes , can you disable it and check

Have you tried to create a new profile in outlook going to control panel > mail > show profiles, imported the PST there and checked how it goes ?

Have you tried to repair your outlook pst .
Repair PST : http://www.slipstick.com/problems/scanpst.htm

go to start --> run --> C:\Program Files\Common Files\System\Mapi\1033
in that open scanpst file
Once it is open , browse and give the location of the outlook.pst file

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ctcorAuthor Commented:
Sunray, thanks for your suggestions. I will try these and post the results. It sounds to me that your leaning towards a suspicious PST file.
ctcorAuthor Commented:
Sunray, my apologies for taking so long to close this. After upgrading the McAfee AV from 7 to 8, the problem has resolved itself. You were on to something while asking if the AV had been disabled. I never tried that.
Thanks very much for all of you suggestions and your help!
I have a Symantec Corporate Edition.Even i disabled, the problem persists.Can anyone suggest me with other solution
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