See if this helps:
Microsoft Internet Explorer 6.x Repair for Windows XP
Also apply's to Outlook Express 6.
Method I
From the Start menu, select Search, select All Files and Folders.
Select More Advanced Options and place a checkmark beside Search Hidden Files and Folders option.
Ensure that Search System Folders and Search Subfolders are also checked.
In the All or Part of the File Name box, type ie.inf
In the Look In drop-down menu, select C: or the letter of the hard drive that contains the Windows folder.
Click the Search button.
In the search results pane, find the ie.inf file located in Windows\Inf folder.
Right click the ie.inf file and click Install on the context menu.
Reboot the computer when the file copy process is complete.
Method II
The second method to try and correct the problem involves editing the registry and reinstalling Internet Explorer 6. The standard cautions apply whenever you are editing the registry. If you need help on how to backup the registry, click
here.
1 If you are having problems only with Internet Explorer 6, proceed as follows:
[Start] [Run] [Regedit]
Registry Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{89820200-ECBD-11cf-8B85-00AA005B4383}
Modify/Create the Value Data Type(s) and Value Name(s) as detailed below.
Data Type: DWORD // Value Name: IsInstalled
Setting for Value Data: [Change the Value from 1 to 0]
Exit Registry and reinstall I.E. (see below)
2 If you are having problems only with Outlook Express 6, proceed as follows:
[Start] [Run] [Regedit]
Registry Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{44BBA840-CC51-11CF-AAFA-00AA00B6015C}
Modify/Create the Value Data Type(s) and Value Name(s) as detailed below.
Data Type: DWORD // Value Name: IsInstalled
Setting for Value Data: [Change the Value from 1 to 0]
Exit Registry and reinstall I.E. (see below)
3 If you are having problems with both Internet Explorer 6 and Outlook Express 6, proceed as follows:
Change the values in both of the registry keys as outlined above.
Exit Registry
4 Once you have made the appropriate registry changes use the link below to download and install Internet Explorer 6. The Internet Explorer 6 download includes Outlook Express 6. Reboot and test for proper operation.
Download Internet Explorer 6:
http://www.microsoft.com/windows/ie/...p1/default.asp