Computer and laptop viruses, seem to be proliferating faster than the
diseases they were named after and like the organic varieties the
instigators and malicious coders who design these programs are making
them harder to detect and they are also coming up with new delivery
methods.
These malicious programs, which probably started life as playful
code, have evolved into rather potent tools capable of making even the
most advanced IT infrastructure hidden behind hardware firewalls grind
to a halt.
This is the main reason why you should always keep your antivirus
software up to date. Last month’s or even last week’s virus definition
data base will not be enough to protect you from the latest incarnation
of even an older virus