FS 04 - Black screen.

Hi there! I am using FS9, and I fly online (with PMDG738), also with the Flight environment from Flight1.My porblem is that my screen suddenly turns black for a couple of seconds during flight... This usually does not happen when I have low fps, but instead, it happens when I`ve got high fps... Anyone?My computer is as follows: (to old to run FS9)Windows XP Professional Service Pack 2 (build 2600)Board: ASUSTeK Computer Inc. P4P800 Rev 1.xxBus Clock: 200 megahertzBIOS: American Megatrends Inc. 080009 08/20/20032.60 gigahertz Intel Pentium 41024 Megabytes Installed MemoryNVIDIA GeForce4 Ti 4600 [Display adapter]ADI TD-523P [Monitor] (14.6"vis, s/n 213T00108766, March 2002)AOC C787 [Monitor] (15.7"vis, s/n YESA536794, February 2001)Primary screen [Monitor] (2x)