Keep your Windows operating systems up-to-date, and use reliable anti-virus
software. Many trustworthy security
software companies offer a free version of their product. Examples include Avast, and AVG. If you are up-to-date, you are no more vulnerable now, than you were yesterday, or last week.
The problem that's being speculated here is simply that the virus is scheduled to use a new algorithm, connecting it to different domains. It could potentially receive new instructions...