Windows 7 64bit, all Windows updates applied as well as proper hardware drivers.
Hardware is an AMD Phenom II X4 955 CPU - quad core at 3.2Ghz. AMD890GX chipset, 4gig of DDR3 memory. ATI Radeon 4800 PCIe video card.
Mouse is a Wireless Laser Mouse 6000. Fresh batteries. Unobstructed receiver.
When running any kind of program installer, the mouse is very "jerky" on the screen.
Checking the Task Manager, I see that one core is running VERY high - 95%, but the other three cores are near idle. Memory usuage never changes - 1.9gig used. Looking at the Processes tab, the highest CPU usage I see is 2% for Task manager itself.
With three idle cores, why would the mouse be jerky?