Plaxo toolbar in MS Oulook and Outlook Express

I need to install Plaxo's toolbar in both MS Outlook and outlook Express. I already have Plaxo in MS Outlook, but I need it now also in Outlook Express. I've tried reinstalling Plaxo several times and rebooting my computer, but Plaxo's toolbar doesn't appear in Outlook Express.

By the way i'm using just one computer.

You might want to check with http://support.plaxo.com or work with Customer Service. Also, if you check your task list, is InstallStub.exe running? It has to be running (with the -a switch) in order to put the Plaxo toolbar into Outlook Express.