Images from google image search.
In few days ago, many people encountered new ransomware via some advertisement server in South Korea. Known as most of victims are used their default web browser in Microsoft Windows OS. Such as weak vaccine like V3 Lite not subservient to resist from new big threat.
Most of victims are belong to Internet explorer (versions not a problem) with poor security level such as turnning off UAC in Windows. Getting higher access privilege under versions of Windows 7 is seems not secured than more if not applied latest security patches.
You may not use any version of Internet Explorer and remove or not allow to use Adobe flashplayer without any sandboxing security as like applied in Firefox or google Chrome browser. It must be not dealt with any terrorist.