Most important aspect of any OS, ECONOMY or COUNTRY is its security i.e how secured your windows and information is from hackers, malware , keyloggers ,phishing , identity protection,viruses, spywares etc. No one likes to be insecured. DO you! No right .
SO here are few tips and software that can protect and secure you .

Before accessing to the world wide web (www) you should be ready with your weapons(kit)

Your armory should consist of the following softwares:

1: A good FIREWALL which can form a great opposing force to the hackers who want to invade your territory. Firewall controls the inbound access and outbound access of applications to your system. It restricts harmful data and hackers to enter your OS
I would recommend you to Download COMMODO FIREWALL (Freeware)
It works great but dont forget to turn off the defence mode if you are using another antivirus

2: You need to install a good antivirus and spyware software to restrict viruses and spyware to enter the OS. (Virus & trojan can Ruin you Os and corrupt your data so always backup your data) Anti-Virus helps to prevent and remove virus from your pc.

FEW Good antivirus+ Anti-Spyware Programs

a: Avast antivirus(Trial)
b: Bitdefender antivirus
c: Kaspersky

3: Now a days Pen drive is playing a major role is transmitting viruses and spywares from one PC to another & most importantly antivirus softwares fail to detect malware and viruses in the pen drive due to autorun feature of windows which makes the viruses directly enter into system files.
To Protect Your Pc from pen drives download: USB DISK SECURITY(trial)

I ALWAYS RECOMMEND PEOPLE TO PLAY SAFE