What is the best FREE anti software to use on my computer?

You get what you pay for in most cases.
There are many free anti-virus programs available, some are better then others and they are regularly changing.


What version of windows is this for ?

Windows 8.1.

I have always trusted the info from this site that documents free software: Best Free Antivirus Software (http://www.techsupportalert.com/best-free-anti-virus-software.htm)

Think about it... A/V software works by detecting the signature of viruses. To detect the signature, the signature has to be in the A/V software's database of signatures. That's why A/V software is constantly being updated. If the software has no revenue how will they pay for the research to constantly find virus, get the signatures and release updates?

I wouldn't trust a freebie to protect my computer.

Avast has high ratings as well as AVG...both have free versions.

I read Computer Active, is it true, in it, it said that Window's 10, will be a Free download, will it work on my 8.1 computer, without slowing it?

Yes, Windows 10 will be a free upgrade for the first year of release. And if you purchased a computer with 8.1 it will run fine.

Thanks!. Much appreciated.