NIS 2011 & Outlook 2010 error Runtime error

Since installing NIS 2011 Retail, whenever I start Outlook 2010 and open an email I get the following error (see attachment):

 

Custom UI Runtime Error in Norton AntiSpam Outlook Plugin

 The call to GetCustomUI() for RibbonID "Microsoft.Outlook.Mail.Read" failed.

 P1: 701656

 P2: 14.0.4763.1000

 P3: 6xk3

 P4: 0x80070002

 

System Info:

Windows 7 Ultimate 6.1.7601 SP1, v.178 Build 7601 (32 bit)
Office 2010 Professional

Intel Core2Duo E8400
4 GB DDR2 PC-6400

 

 

Thanks for any help!