I'm sorry to hear about this. You may have accidentally downloaded it when you clicked on a link while you are browsing the internet. Let me help you with this. Please do the following on your computer.
1. Open the Control Panel and go to Apps&Features. Look for a malicious program such as Mindspark or any related program which has been recently installed on your computer and hit the Uninstall button. 2. Remove unnecessary toolbars on your browsers. Click on this link for the instructions. Uninstalling Unwanted Toolbars in Web Browsers 3. Clear Browsing history on your web browsers. These are the instructions Clear web browsers' cache 4. Run a Full Scan on your computer.