If you installed Money 2005 from a CD, that is likely the problem. Money 2005 needs an online update that is no longer available.
Go to the second "sticky" post in this forum:
http://social.microsoft.com/Forums/en-US/479281b2-90f9-42ca-85f7-644fc6e1e5c3/download-microsoft-money-installation-files-solve-activation-and-some-other-errors?forum=money
and download the version of Money that is appropriate for your region. If you are in the UK that will be the 2005 Money version in that post. It has the required update. Be sure to uninstall your current Money 2005 before you install the
downloaded program.
Let us know if this works for you.
Bill Becker