Hi I am trying to create a file for use with the convolve opcode using the cvanal utility. My operating system is winXP. I use cvanal appropriately AFAICT. I get error messages popping up complaining that "This application has failed to start because python25.dll was not found. Re-installing the application may fix the problem." If I have 2.4 installed, it complains that 2.5 is missing. If 2.5 is installed it is missing 2.4. I _do_ have PYTHONPATH set, and PATH set to find Python, so I am a little confused as to what is going on here. This feels to me like a dumb question, but after plugging away at it I'm no clearer as to what might be the problem. Any pointers would be greatly appreciated. Thanks! Stuart