error message

[Guest]

When Xp starts up I get an error message : c:\windows\system32\cthelper.exe
NTVDM CPU found a non-allowed instruction

What does this mean, and how do I get rid of it?
There are two users on my machine.

 

[Kenrick Fu]

Do you have a Creative sound card with your computer? cthelper.exe is a
helper application for Creative sound card driver, you may need to download
and reinstall an updated sound driver from Creative web site:
http://www.creative.com/language.asp?sDestUrl=/support/downloads