The information comes from a series of Secunia Country Reports based on data from the company's Personal Software Inspector.
And the company says 25 percent of all computers don't even have that basic level of protection in place.
Microsoft fixes 14 CVEs in April Patch Tuesday, but outstanding issues remain, including a vulnerability demonstrated at last month's Pwn2Own event.
Browser security is about more than just the padlock in the HTML5 era
You'll now need to jump through another hoop if you want to change an AppleID.
What's wrong and what's right with SSL? Nearly two decades after he helped write SSL 3.0, Paul Kocher is looking to hardware for security.
Chrome, Internet Explorer and Safari are all vulnerable.