NAV 2009 Uninstall/Install Loop

I recently took advantage of an offer to upgrade to NAV2009. The installation program removed my old version (NAV 2006), installed NAV 2009 and every thing was fine. The next time I rebooted the computer, I got a dialog box asking me whether I wanted to perform a Custom Uninstall or a Complete Uninstall. I cancelled the box and went on with my business. Now everytime I reboot the computer I get the message asking me to uninstall.

 

One time I chose the Custom Uninstall option and let the program uninstall and then re-install all over again. That did not help. I still get the uninstall dialog box everytime I boot. Has anyone encountered this behavior before?

 

The PC is a ThinkPad T60 running Windows XP SP3. The only other security software is Webroot spysweeper.

 

Any help would be greatly appreciated.

 

SSGMiami