[Tureyhall]

um, what are you talking about? were you trying to compile robot code, or the actual MPLab.exe from MPLab source? (i don't think Microchip has released source code for MPLab, so if you're trying that, it won't work.)

assuming that you are trying to compile robot code, does the default code compile? have you ever compiled on this comp before? did you remember to install mcc18 compiler? did you check all of the checkboxes in the mcc18 installer? (associate this with MPLab, etc.) are you using MPLab 7.20? have you tried re-installing MPLab and mcc18?