Norton subscription renew in windows xp version?

when i bought a new system it was in vista version and Norton was updated all this day was running now and 2 months back i was not happy with vista so i uploaded windows xp version now the problem is like my Norton renewed atomically that i got to no through my mail but my system is showing my Norton is expiring and still 18 days left now what to do for this please suggest me by atomically renewing the amount as been taken through my c card but my system is still showing renew it pls suggest me in this its urgent.|||I think you should call them and ask them what happened! You should have had the posibility to opt-out from the continuous renewal if you didn't want it!|||Contact the company.