If you are installing from the blue disc, you shouldn't have any problems.
But remember to right-click the install program and "Run As Administrator".
If you are installing from an older Black and White disc, there are a few extra steps to follow.
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Re: IOC on 18F2580?
why not use one of the interrupt pins int0 int1 int2
richard Yesterday, 23:54alternatively
portb pins 4 to 7 have interrupt on change capability
read data sheet interrupt section and i/o port sections ...