We all know that surfing the internet, without any antivirus software, is suicide for computer, and sometimes when your computer get infection, it's hard to repair it. You lose your files when formatting a partition, (especially the most important - Serious Sam files).
Nothing give you 100% security, but installing some sort of software WILL help you avoid these threats.
When your computer work slower, you don't have anti-virus program, or you can see there's something wrong, you should install it and check for viruses or malware.
Source: Wikipedia(Malware, short for malicious software, is software used or programmed by attackers to disrupt computer operation, gather sensitive information, or gain access to private computer systems)
Anti-virus
First of all, is avoiding the viruses on your computer. It's the most popular danger in the internet.
You can find a lot of anti-viruses in web, the best software isn't for free, but even free programs have the same functions, as paid soft. In my opinion, Nod32 is the best program.
I will introduce some free programs below.
Source: freebies.about.comAVG Anti-Virus Free 2014 DownloaD
Anti-Virus Free 2014 from AVG is one of the best free antivirus software tools available and is probably my personal favorite.
AVG Anti-Virus Free is a full-fledged antivirus and antispyware tool, includes an email scanner, link scanner, scheduled scanning options, automatic updates, and more. There is no need to pay for an antivirus program when one this good is just a download away.
AVG Anti-Virus Free 2014 works on Windows 8, Windows 7, Windows Vista, and Windows XP.
The huge number of premium features, frequency of updating, and install-it-and-forget-it aspect of AVG's Anti-Virus Free 2014 really do make it one of the best of the best free antivirus programs available today.
Comodo Antivirus 6 DownloaD (the button on the right)
Comodo Antivirus 6 from Comodo Security Solutions is another excellent program, easily one of the best free antivirus options out there. Comodo Antivirus 6 protects you from several threat sources, just as most of the other free antivirus programs on this list do.
Comodo Antivirus 6 works on Windows 7 and Windows Vista.
Comodo Antivirus 6 ranks as a best free antivirus solution almost solely because of its Defense+ technology that, by default, assumes unknown files are threats instead of safe. That sounds like it might cause problems but Comodo Antivirus utilizes some other technologies to make the whole process silent but still very effective.
avast! Free Antivirus 8 DownloaD link from the main site, don't worry.
AVAST Software's avast! Free Antivirus 8 most certainly deserves to be on any list of the best free antivirus programs. avast! Free Antivirus has fully functioning antivirus and antispyware engines protecting your PC from threats from the Internet, your files, emails, and even instant messages.
avast! Free Antivirus 8 supports Windows 8, Windows 7, Windows Vista, and Windows XP.
One big reason I included avast! Free Antivirus 8 as a best free antivirus program is because of its "heuristics engine" which can detect previously unknown viruses and other malware. I also like the fact that AVAST has been making this antivirus product since 1988 and is often cited as the most installed antivirus product.
Avira Free AntiVirus 2013 DownloaD
Avira Free AntiVirus 2013 protects you from viruses, Trojans, worms, spyware, adware, and various other kinds of malware, making it a fully functional antimalware tool and certainly one of the best free antivirus programs.
Avira Free AntiVirus 2013 works on Windows 7, Windows Vista, and Windows XP. Avira also makes Avira Free for Linux.
The scope of malware that Avira Free AntiVirus 2013 can keep you safe from is alone enough to make it one of the best free antivirus software programs but the heuristics and ease of use add to its value too. The only things I didn't like about Avira Free AntiVirus 2013 was the configuration you have to complete after installation which might be intimidating if you're a computer novice.
Panda Cloud Antivirus Free 2 DownloaD button in the middle
Panda Cloud Antivirus Free 2 protects you from several kinds of malware threats - viruses, worms, Trojans, adware, and more - just like all the other free antivirus programs in this list.
What makes Panda Cloud Antivirus Free 2 one of the best free antivirus programs is that it does its job from "the cloud" meaning the hard antivirus work that typically slows down a computer is done on computers elsewhere on the Internet, freeing up your computer to work like it should and protecting you from malware even better.
Panda Cloud Antivirus Free 2 supports Windows 8, Windows 7, Windows Vista, and Windows XP.
Tip: Panda Cloud Antivirus Free tries to install a toolbar and change your browser's home page and default search provider during the installation process. Uncheck those boxes before continuing if you don't want them. None of those changes are required to use Panda Cloud Antivirus.
If you have installed one of those, you should scan your whole computer with it.
Removing viruses may even speed-up your PC ^^. But about speedup and conservation i will write in another article.
Malware
I think it's the worst sh*t you could have on your pc, but not as popular as viruses.
It can slow down your PC alot, malware packs can include viruses, worms, trojans, rootkits, dialers and spyware, and in the worsc cases, someone could know your passwords, to all sites you have entered. In the consequence, you lose your account, and the hijacker know all informations that were there.
To prevent that you should install one, very good program, description below.
The database updates frequently so, don't worry about new malware, it's the right choice.Malwarebytes Anti-Malware DownloaD
Malwarebytes' primary feature is to scan your computer for the bad guys, and on that level it's quite successful. It offers a quick scan, a full scan, and a flash scan to analyze memory and autorun objects. It comes with Malwarebytes' proprietary Chameleon technology, which lets the program install on many infected computers even when the malware blocks other detection tools.
Firewall
I'm not using firewall, but if you want to be super-protected, you should download firewall.
I've found for you a good firewall that will protect your computer against unauthorized access from web.
Source: pcworld.comComodo Firewall DownloaD
If you want maximum firewall protection--and can endure some annoyance--you'd do well with Comodo Firewall, an extremely effective protection tool to keep yourself safe from Internet dangers. It blocks Trojans, hackers trying to take control of your PC, and other threats--all for free.
When you install Comodo Firewall, you choose to install only the basic firewall, the "Firewall with Optimum Proactive Defense" (which also protects against malware which can bypass firewalls), or the Firewall with Maximum Proactive Defense+, which does what "Firewall with Optimum Proactive Defense" does, plus protecting against "leaks"--information about things such as open ports on your PC being sent out over the Internet. The higher the level of protection, the greater the firewall's intrusiveness, so you must balance protection versus annoyance when making your choice. You can change the level of protection later, when the program's running.
And at the end, use your head when surfing the internet, so nothing will endanger your computer
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