Necesito una antivirus que me ayude,

Hola,
me aparece esto en mi computador por medio de uan ventana emergente a cada rato. Warning your computer contains various of viruses and malware programs presence

Your system requires immediate anti viruses check! Antivirus 360 wil perform a quick and free sacanning of your PC for viruses and malicious programs

porfavor ayudenme a eliminarlo