Barbara,
I found one of the problems. When my app first starts it checks to see if MSProject is installed. I use the following code
cOptPath = ""
DIMENSION aCLSIDs[1]

SET CLASSLIB TO registry.vcx ADDITIVE
oReg = CREATEOBJECT("Registry")

*Grab array of CLSIDs
IF oReg.EnumOptions(@aCLSIDs,cOptPath,"",.T.) # 0
RETURN .F.
ENDIF

IF ASCAN(aCLSIDs,"MSProject.Application") > 0
mpckek = .T.
*MESSAGEBOX("Found It")
ELSE
mpckek = .F.
*MESSAGEBOX("Couldn't find it.")
ENDIF

This code dosen't seem to work in W2K