I use Proworx Nxt, when online with a PLC (XP SP2) my laptop CPU usage runs 99% most of the time.
Has anyone seen this problem, can it be fixed?

 

When you are ONLINE click on the EDIT tab and go down to UPDATE RATE... and see if the slide bar is set to max speed for I/O update. This can slow down the operating system speed.

 

I have tried reducing the UPDATE RATE, it seems to help some, but the CPU still runs at 99%.