I had the same problem, until I discovered the OpenVC add-in iwth its "NukeNCB" button...it works for me! Andy Metcalfe - Sonardyne International Ltd (andy.metcalfe@lineone.net) http://www.resorg.co.uk "I used to be a medieval re-enactor, but I'm (nearly) alright now..."

Hi. Your code would be right for a console (or DOS) app, which is run as a sequence. As mentioned above, you block the message pump, because you do your work in thread which runs the GUI of your app. So you block the whole app! There are some ways to avoid this problem: 1. Use threads Count in a thread and send the changes as a (User-)message to the main window. 2. Use a timer Create a timer when clicked on "Start" and kill it when clicked on "Stop" In the timer routine you can do your UpdateData(). A propos: Never forget to call UpdateData(TRUE) before UpdateData(FALSE) !! Learning to make a good desing will save you a lot of trouble! Bye, Karl

void CCreatprocessDlg::OnRun() { STARTUPINFO siStartInfo; PROCESS_INFORMATION piProcInfo; BOOL fPass; // ADD THIS memset( &siStartInfo, 0, sizeof( siStartInfo )); siStartInfo.cb = sizeof( siStartInfo ); fPass = CreateProcess("c:\\Program Files\\Accessories\\Mspaint.exe", NULL, NULL, NULL, FALSE, NORMAL_PRIORITY_CLASS, NULL, NULL, &siStartInfo, &piProcInfo); if (!fPass) MessageBox("Can not execute WordPad.exe.", "Warning",MB_ICONHAND); } That should get it.

Not without more information. Saying why do I get an Invalid Page Fault is like asking why I get an access violation or a general protection fault. Post the suspected code and maybe someone can help out.