However, I don't think we need to create a law to force people to update or install that kind of software because it will create unnecessary panic of remote softwares. I think a few people know about hacker and become the hacker's hide point.If we create a law to force people do it, basically, we will loss our freedom of making decisions. I think it's a decision which depends on our decision.
Also, we need a lot of money to support the develop of the antivirus software to make sure it will defend the virus. Hacker could update the virus everyday to keep them steal the important information from the net.