Off topic, sorry
Just out of curiosity, have viruses, and other forms of malware evolved?
What can they do to infected computers now?
Mostly with vulnerabilities, in either Windows or 3rd party software such as Flash, Adobe reader and the worst of the worst Java. Also known as drive by downloads, commonly used in infected banner ads on completely legit websites, which is why
A) I sandbox all of my Internet Web Browsing on ALL my computers using Sandboxie
B) I block ads.
It goes down like this, A user has an out of date version of one or all of the above which has not been patched, they visit a site with an infected banner ad or a site with a vulnerability on it and BOOM, they are infected.
Below is how I explain it to my customers when they are using an out of date version of anything
I tell them this is what your security should look like
This is what your security currently looks like