[X4U] OS crawling through chores

[James Hurley]

I have two Macs (Powerbook, and MacBook, both 10.4.9)

The MacBook is fine but the Powerbook is glacial. Constantly get the  
spinning beach ball--while typing, selecting menus, etc.

The activity monitor shows heavy SystemUIServer usage, over 70%  
during beach ball spins  . I get no such activity on the MacBook  
doing the same operations.

If there a virus going around?

Jim