Still no reply? Never mind. I found solution myself. I'll tell you how I did that. When you type lsmod you can see kernel modules loaded at that time into the memory. I see ath_pci and ath_hal in the output of lsmod which are responsible to make my wireless card working. I want to block these modules because they aren't supporting my wifi card. In order to do that first open up a console, become root and then type following.
Add the modules you want to block each one on one line. In my case they were ath_pci and ath_hal. Restart your system and look back again to the output of lsmod. You won't see them again