Norton Internet Security

[woodchopper]

When NIS subscription expires is the computer left defenceless or just unable to download new definitions?

[Buenchico]

Both of these threads suggest that it ceases to function completely:

http://community.norton.com/forums/what-happens-when-my-subscription-expires

http://community.norton.com/en/comment/2580863

Save yourself some money. Remove Norton using the proper tool for the job:
https://support.norton.com/sp/en/uk/home/current/solutions/v60392881_EndUserProfile_en_us
and install Avast instead:
https://www.avast.com/en-gb/index