Thank you for the reply Richard. I have tried downloading the latest drivers for my NVIDIA GEFORCE4 MX20 card and changing the refresh rate however I still get messages saying that an illegal operation has been detected etc with all sorts of codes (NTVDM CPU has encountered an illegal instruction). I am really desperate to get this program working again however it does not look like its going to happen. The people from Nommissoft were helpful and told me to download someting called VDMS etc but that did not work either?