Hi,

I assume you followed this instruction.
http://www.melabs.com/support/mplab.htm
Did you try setting the language tool suite in MPLAB? Have to ask.

I have not upgraded to MPLAB8 yet. Have you check the path to MPASM?

I bet the problem is with *.bat file. Run as admin?

The only problem I have had is with the *.bat file. But I use linux.