My Win 7 64bit says only 3.73GB is usable out of 8GB. Can anyone help me correct this? Or is this normal? Any setting in the BIOS to adjust so that the entire 8GB is recognized?

The BIOS recognizes 8GB RAM....I followed the instructions in the manual regarding Dual Channel Memory Configuration by installing the two 4GB RAM on the slots with similar color to activate dual channel config...I also tried CPU Z- CPUID and it likewise recognize the 8GB RAM....

BTW...my motherboard is ASrock A75 Pro4-M, AMD A8 3870, with 8Gig RAM and yung GPU ko is AMD Radeon HD 6670