I recently purchased an IBM 750C colour notebook, running IBM Dos 5 and tried to install a recent version of CT (8.21) on it. Unfortunately, CT did not run and the machine provided me with the following message: "Fatal Error Previously installed software is neither VCPI nor DPMI compatible" Anyone have any idea about the problem and how to fix it? Thanks and 73 Steve Tobe, VE3XO tobe@utcc.utoronto.ca