Need a Best antivirus to protect my computer??

I am Marvan, I am a photographer. As I am a photographer and I am maintaining all my data in my computer and I have an internet connection too.From last two three weeks I am facing a problem that my computer is not working properly and it use to hang more time. Is this due to virus? I have spent lot of time on internet but I am hopeless. So, please help to get any information as soon as possible.

Hello Marvan; As you said that you are a photographer and you have to store photos in computer and I hope u edit photos through computer only. And you also said that is your system affected by virus. You are right my friend this is due to virus only. There are many websites which provide antiviruses at Low Cost and the antiviruses are very helpful and protects computer from viruses and all types of bad sectors.