Display colors fade to bluish periodically

I have been having issues with my computer lately after a brief encounter with a couple of trojan viruses, which have been successfully elimated via McAfee Anitvirus software. It may be unrelated but ever since my display has been flickering from full color to a faded out bluish color. This happens most often when I initially start the computer and is intermitten. I am running Windows XP Pro, on a Gateway E 3400, Pentium III, 930 MHz, with 256 Megs of RAM. My adapter is a Rage 128 Ultra, 800x600 True Color 32 bit, 60Mhz. I have tried uploading to a new driver but I get DLL message that reads: 16 bit window subsystem: C:\Program1\symantec\s32evnt1.dll. An installable Virtual Device Driver failed DLL initialization Choose close to terminate application or choose ignore. Any suggestions? -Cathy

 

Is the monitor connection secure?