but did you re-create the Outlook profile? seems the things are fragile...check this out:
Microsoft Knowledge Base Article - 320856
OL2000: An Invalid Page Fault Occurs in the Outllib.dll Module If You Customize the Standard Toolbar in Outlook
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This article was previously published under Q320856
SYMPTOMS
If you try to customize the Standard toolbar in Microsoft Outlook 2000, you may receive an error message similar to the following:
This program has performed an illegal operation and will be shut down.
If the problem persists, contact the program vendor.
If you click Details, you may receive the following error message:
OUTLOOK caused an invalid page fault in module OUTLLIB.DLL.
CAUSE
This problem may occur if the Outlook 2000 user e-mail profile is damaged.
RESOLUTION
To resolve this problem, re-create the Outlook user e-mail profile.
NOTE: If you turned on the Outlook e-mail service option Internet Only, you must first reconfigure Outlook to use the Corporate or Workgroup option to implement a new user e-mail profile.
To reconfigure Outlook with the Corporate or Workgroup option, and to re-create an Outlook e-mail profile, follow these steps:
Part 1: Change to the "Corporate or Workgroup" Installation
Start Outlook.
On the Tools menu, click Options.
Click the Mail Delivery tab, and then click Reconfigure Mail Support.
On the E-mail Service Options page, click Corporate or Workgroup, and then click Next.
Follow the on-screen instructions to reconfigure Outlook e-mail support.