how to get 3 months of antivirus(loads of choices)

hey guyz,so my antivirus was getting old and i decided to get one so i was searching around microsfots page and found these antiviruses: bitdefender,vision power,trnd micro,norton,panda,avg,mcafee,zone alarm,ca,windows live onecare,gdata,bullguard,kaspersky,quick heal,k7 computing,eset,f-secure.
microsoft redirects you to their pages which gives 90 dail trial (i recommend this if you urgintly need an antivirus)

heres the link:

http://www.microsoft.com/windows/antivirus-partners/windows-vista.aspx

REP+ if this was helpful

They always supply 3 month sub's, but their really annoying after it. I would advise getting some sort of Free long term AV instead of those sponsored.