Try running the Setup Utility on this page ...It has an effect on MCS too.
Close MCS and MPLAB before running.
http://melabs.com/support/mplab.htm

Make sure your MPLAB installation is current. (even though you don't use the MPLAB IDE)
http://www.microchip.com/stellent/id...&part=SW007002


Other than that, please be more specific about what errors you are encountering.