Scenery read error. Attempting to open a non-existent d...

A strange problem has recently started with FS2004. Sometimes when starting FS2004, it will get to the very end of loading scenery when a dialog will appear with this message:Scenery read error. Attempting to open a non-existent directory:C:windowssystem32mcisphirtextureClick OK to continueI've examined the directory path above and the folder mcisphir contains a single McAfee DLL file (I have the McAfee AV suite installed). Clicking OK will sometimes take me to the FS2004 world without problem, other times I get a message saying I should restart FS2004.The first time this happened, I ran a check disk on my system and everything was fine for the next few FS2004 sessions, but now the problem has reappeared.Anybody seen this before?Thanks.-- WaltFlying FS9.1 full screen at 1600x1200x32Intel Pentium 4 640 HT 3.20 GHzWindows XP Pro SP21GB Dual Channel DDR2 SDRAM at 533MHz (2x512M)256MB PCI Express x16 ATI Radeon X850 XT PECatalyst 5.9 drivers for Windows XPDirectX 9.0cViewSonic P95f+ 19 inch Ultrabrite CRT MonitorSound Blaster Audigy2 ZSCreative I-Trigue 2.1 3300 SpeakersSaitek Gamers Keyboard USBLogitech MX 518 Optical Mouse USBMS ForceFeedback 2 joystick USBBelkin Hi-Speed USB 2.0 7-Port HubWideFS 6.5.1.0ActiveSky 6 SU2FSUIPC 3.53 RegisteredFS Force 1.02FSNavigator 4.6Active Camera 2004 v2.0LAGO FSEAISmooth V 1.11aJABScreen v2.2Linksys Wireless Router WRT54G 802.11gNETWORKED SYSTEM (Running WideFS Client & ASV):Intel Pentium 4, 2.0 GHzWindows XP Pro SP2512 MB RAM