NIS 2011 High CPU Usage

Ever since I updgrated from NIS 2010 to NIS 2011, "explorer.exe" has been consisting running at 50 CPU on my Vista 32-bit laptop.  It seems to be working fine, however, on my Vista 64-bit desktop.  Any idea why this might be happening?  I never had this problem with NIS 2010.

 

Thanks!