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A Previous Installation Has Pending Work Requiring a Reboot
http://www.vistaarticles.com/articles/167/1/A-Previous-Installation-Has-Pending-Work-Requiring-a-Reboot
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Published on 11/23/2006
 
When you attempt to install Internet Explorer 6.0 on a Microsoft Windows Millennium Edition (Me)-based computer, you may receive an error message similar to the following

A Previous Installation Has Pending Work Requiring a Reboot
1. Click Start, and then click Run.
2. In the Open box, type msconfig, and then click OK.
3. Click the General tab.
4. Click to clear each check box except Load Static VxDs.
5. Click Apply, and then click OK.
6. When prompted, restart your computer.
7. Restart Internet Explorer Setup.