Make sure your second monitor is plugged in when you start your computer. If Hoster is running in dual display mode and doesn't see the second monitor, this could be the cause of your error messages. At least I think this may be the case. I remember having the same problem awhile back, and think this was what was causing it on my system.
Also make sure you have updated to the latest drivers for your video card. You might also double check your system bios and see if there is a flash update for it. Have you recently upgraded to XP or did your system come preinstalled with it?
Just throwin out some ideas...
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