I'm trying to register ACT 10 on an XP SP2 and get the message (not verbatim but close):
The registration process has detected the Microsoft SQL server 2005 standard edition is installed but the current serial number prevents access. Uninstall SQL and use disc 1 to reinstall Act and register.
I have tried this using instructions out of knowledgebase without success and get error message during install but then message saying it was succesful.
My hard drive died on this computer so I'm having to reinstall programs. The first time i installed 10.0 (prior to HD dying) it went fine and had no problems registering.