Free security
Be secure
WOT is a free program that will warn you before entering a dubious site.
WOT is a further layer of security, but not a replacement for anti virus.
Maybe you are not sure which program will suit your pc? Or you have only tried one all the time?
Remember that not two machines are identical; what works well on one may not be optimal on another.
Try more than one before you decide - but not all at the same time as they may conflict.
Free Anti Virus
- AVG: http://www.avg.com/product-avg-anti-virus-free-edition
- Avast: http://www.avast.com/eng/avast_4_home.html
- Aviras AntiVir: http://www.free-av.com/
Free Anti Spyware
Free Online Scanners
If you want a 'second opinion' try this: http://www.mywot.com/wiki/Online_tools
Free vs. paid
Please note that "Free of charge" usually means non-commercial & home use only
(and both of these conditions should be met). A paid version is still better, if you can afford it...