Norton AV 2003 subscription URGENT!

URGENT help needed!
I have loaded Norton anti Virus 2003 on a system.
Unknown to me the clock/date was wrong.
the version is new retail and after installation it is showing only 3 months subscription left!
i have tried uninstalling, removing allregistry entries, resetting clock and then re-installing to no avail?
Other than reformating is there any way around this or is it going to cost me anew subscription on top of the new purchase?
Thanks