Error message in Outlook after removing AVG

I have recently had problems with Grisoft AVG and ended up replacing it with Avira.

I had difficulty uninstalling AVG, and had to manually delete all AVG folders and files that I could find and then repairing the registry with System Mechanic.

My remaining problem is that when I click any E-mail message in Outlook 2003, I get a pop-up box "Microsodt Office Outlook: The add-in "C:\PROGRA~1\Grisoft\AVGFRE~1\avgxch32.dll" could not be installed or loaded. This problem may be resolved by using Detect and Repair on the Help menu"

I've tried using Detect and Repair but it fails to run.

Please could you help me complete the change to Avira by getting rid of this error?Start Free Trial