I attempted the add/remove programs in XP but the only place it is shown is in add Windows components which does not repair IE6 as it did in other versions
But the method below is a way to do it and so far for me it has worked
The ideal way is to edit the registry as described in the link at the bottom of this post
but I have stayed away from registry editing in XP as it can be problematical
Method 1: Reinstall or Repair Windows XP
To repair or reinstall Internet Explorer and Outlook Express in Windows XP, complete the following procedure while you are logged on as an administrator:
1.Use the System File Checker tool to scan all of the protected files on your computer:
1.Click Start, and then click Run.
2.In the Open box, type sfc /scannow, and then click OK. Note that you may be prompted to insert the Windows XP installation CD-ROM.
3.Test to determine if the issue is resolved. If the issue is resolved, skip the remaining steps. If the issue is not resolved, continue to the next step.
3.Edit the registry(on how and what) more information is posted in the link below
4.Complete an in-place upgrade of Windows XP, a repair of Windows XP, or reinstall Windows XP. For additional information about how to complete an in-place upgrade or repair of Windows XP, click the article number below to view the article in the Microsoft Knowledge Base:
How to Perform an In-Place Upgrade (Reinstallation) of Windows XP
Additional information on editing the registry and the complete article about IE6 click or copy this link