I have been using PSP Pro for many year since its Dos 3.1 incarnation and have never had your trouble. It must be something to do with your setup. Can you start your computer in minimum mode by removing all software not need from your start up menu, then run PSP and see if the fault recurs. If not, gradually replace the start up programs until you generate the fault . This should show you which program is causing the trouble. That is not a very good explation! perhaps someone else can do a better one.