Programs are interfering with screen saver

I just found a major flaw in my screen savers I created. In all cases if the user receives an instant message. The message is displayed briefly on the screen with the screen saver running. Also if a virus scan runs while the screen saver is running the results are displayed with the screen saver running in the background. How do I keep the screen saver from allowing anything from being displayed?
I do have the following line that I thought would help
SetWindowPos Me.hwnd, HWND_TOPMOST, 0&, 0&, typ_DisplayRect.Right, typ_DisplayRect.Bottom, SWP_SHOWWINDOW ' Size window and make top most

The screen savers that come with Windows XP do not display these popups. All of the screen savers were written in VB 6.0

Thank You