Norton Antivirus 2010 Subscription Problem

I have a problem, this morning I overclock my processor, but in the end my system is not running at all, so I reset the bios jumper, and my system back to work again, but the date was wrong, so I fix it on bios, and when I login an error message appear from norton tells me that mu Subscription was end and need to be renew. What the heck, I activate my norton in this month, and now I need to renew it. I dont know what to do so I asked here, is it enough to enter my key again, or my Subscription is totally waste? I'm new using norton cuz I'm used using free av like antivir