I'm still new to bitcoins and I need help tweaking my setting so that I can probably having 40+Mhash/s. I'm currently running at 9-12Mhash/s.

Processor - Intel Core 2 Quad Q9550 @2.83Ghz
Graphic card - RADEON HD5450 1GB
RAM - 4GB

What type of tweaks that can increase my mining rate?

Thanks in advance.