Dragon Naturally Speaking

I have WinXP-Pro. Ever since I installed SP2, I get the following message when I tried to install DNS:

Error Number 0x80040707
Description Dll function call crashed: DD10shrd.RgyCorrectCLSIDs
Setup will now terminate

The DNS site suggests the SP2 is the problem, and while the give a “workaround” for Ver. 7, and say that Ver.8 fixed it, they offer no solution for users of Ver.6. Does anyone useing DNS ver. 6 have this problem or can offer any solutions?
Thanks
Dave