Norton Internet Security Installation Help

I have a virus on my desktop which is preventing me from accessing the internet.  I renewed my subscription to Norton Internet Security via my laptop (and completed the download to my laptop) but now I am unable to access the internet on my desktop so I can download my subscription renewal on my desktop.  I thought if I could find a subscription renewal code it might help???

 

My desktop is going crazy and keeps popping up what I believe to be fake Windows Alerts which are asking me to renew my "XP Internet Security 2012".  Each time I click on Norton, the fake Windows alerts pop up instead.

 

Have a I any hope of a fix?