Have a client that is using Outlook XP on Win XP. When he tries to add attachments to outgoing emails, when he clicks on Insert File and then clicks on folders, Outlook locks up. He can insert files that are on the root individually, though. I tested and the client can browse folders to add attachments from Comcast email. So it's definitely Outlook. I tried Detect and Repair fom within Outlook and a system restore but to no avail. At a lost.