Useful Links

MalwareBytes Anti-Malware:  Free software to find and remove Spyware.  Available at http://www.download.com.

AVG Free Antivirus Software.  Available from http://www.avg.com and http://www.download.com.
Avast Free Antivirus Software.  Available from http://www.avast.com and http://www.download.com.

Other Antivirus SoftwareNorton, McAfee.

Also consider ClamWin, a free Antivirus program that works on old (low powered) computers.

Adblocker Adblock Plus, an internet add-on for Chrome, Firefox, and Internet Explorer to block (some) adverts.