What is the best antivirus program that can detect and delete all virus and needs only a small space on your computer?

It can be free or not free

I did have Ad-Aware but it broke, so I was wondering is there anything better? I don’t mind paying if it’s worth it, but could someone recommend some I could try. Free or pay – Just whatever. Could you also tell me the features of them, and why it’s worth getting?
Thank you!! =]

Whats the Best Anti Virus Program for PC?

Recently I had to repair my computer.
but i badly need and anti virus program that is easy on the wallet.