How to protect my computer from bad sectors and viruses??

I am a student of computer field, I use to play and download games through internet. After downloading games I found that the games do not work properly and also the system. Is this due to a virus? So, is there any idea to download games and other things without any virus?

I think you must buy an antivirus for your system which will help you to get rid of virus and other critical errors. The antivirus will also support to maintain downloading and all types of files downloaded through internet. I know one of the website which is very helpful and it provides really Cheap AntiVirus and is a no. 1 resource for computer specializing in antivirus, antispyware, internet security, backup & restore, and all-in-one security software.