When installing IE 5.x, you receive:
Windows Update Setup
A previous program installation was never completed. You need to restart your computer to complete that installation before running Internet Explorer Setup. Setup will now close.
Press OK and restart your computer. Run IE setup again. If the error persists:
1. Delete the PendingFileRenameOperations value name.
2. Delete the PendingFileRenameOperations value name from the following keys, if it exists:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnceEx
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServicesOnce
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
NOTE: If the problem persists, remove everything you can from the %TEMP% folder, empty the Temporary Internet Files folder, and delete any root folder named $!$!$!$!.