Random redirectsmart.net pop-up ads is a sign that your computer is infected with an adware.
On first step, open Control panel, then Uninstall a program, and uninstall all unknown and suspicious software. Next, download AdwCleaner and Malwarebytes antimalware from links below. Both are free.
AdwCleaner by Xplode from http://www.myantispyware.com/download/adwcleaner
MalwareBytes Anti-Malware from http://www.myantispyware.com/download/malwarebytes-anti-malware
Close all other applications and double-click AdwCleaner. Once this tool is started, click the Scan button to run a scan process. After the scan finishes click Clean button.
Next, run mbam-setup to start the installation of Malwarebytes Anti-Malware. It will open the Malwarebytes Anti-Malware Setup Wizard. Follow the prompts. When the installation is done, click to Scan now to perform a system scan. When the scan has completed, click on the Remove Selected button.
If you are still having troubles with the redirectsmart.net ads, then try to reset your browser to default settings. Use the instructions:
How to reset Internet Explorer http://www.myantispyware.com/2016/03/07/how-to-reset-internet-explorer-settings-to-default/
How to reset Mozilla Firefox http://www.myantispyware.com/2016/02/07/how-to-reset-mozilla-firefox-settings-to-default/
How to reset Google Chrome http://www.myantispyware.com/2016/01/06/how-to-reset-google-chrome-settings-to-default/