Invalid class string

hi!

i'm getting this error when i run my asp app in windows xp.

Server object, ASP 0177 (0x800401F3)
Invalid class string
/cem/reports/AlwaysRequiredSteps.asp, line 9

This app works well in windows 2k but when i upgrade my pc to xp it produced this error.

This error points to this code:

Set session("oApp") = Server.CreateObject("CrystalRuntime.Application.10")

It seems that xp does not recognize this crystal report object.

Thanks in advance for your replies.