ESET has extended "free trial" period of full version to 90 days. Note: I do not work for them, but this could be a big help to people having issues with malware. :
Norton Internet Security 90 Days Trial Version - Colaboratory
Bitdefender - Get 90 days FREE trial to secure your PC with the Best 2014 Antivirus. Enjoy the advantages of being part of our Facebook community! :) http://bit.ly/Bitdefender_Total_Security | Facebook