I recently updated to Windows 95. I now have a problem calling MPLABC from inside MPLAB 3.12.00 with Win95 running: MPLAB tried to execute an invalid instruction while calling MPLABC in DOS mode. At this point the error dialog box instructs me to exit and restart the computer. Alternately, on another previously compilable project, MPLAB reports compiler success, even though the DOS compiler screen writing never appeared and no program hex listing was generated. I seem to remember a thread about a problem like this a while back. How was this problem rectified? Paul