Are the free anti-virus software safe for my computer ?

In my experience, the internet has provided some of the best tools at no cost while some of the well-known costly products perform less than desirable yet everyone still buys them. The two worst anti-virus products I ever used were Norton and McAfee, which I purchased. I had some bad free ones too but the one I am very happy with as it does not hog resources, has frequent updates, and provides high level of protection is by Avast.

The internet is of course full of snake oil salesmen. Don't rely on the website peddling the product. Use known and reputable websites that serve the computing industry (CNET, TUCOWS, MAXIMUMPC) to verify if a product is tried and tested.

Are the free anti-virus software safe for my computer ?microsoft

You would be better off getting a name brand one when they are on sale. The one from Norton and from McAfee are alwyas going on sale at Staples and CompUSA with 100% rebate. You buy it and they give you your money back. That way you know it is a good one and it is still free.

I have tried the ones on Internet. They don't get everything and they trigger a flood of constant emails from their vendor trying to sell you something else.

Are the free anti-virus software safe for my computer ?norton ghost

AVG is totally safe for your computer, and it works better/is easier to use than Norton AntiVirus. If you're just using it at home, you can download it for free. Just google "AVG free"
Absolutely not. If you install a free anti-virus programme It'll try to advertise its website or the partner sites in the form of unwanted popups.Sometimes they might even contain harmfull files like adwares and spyware . I would recommend if you wanna save money get a good low cost Anti virus solution like this