Hi, I recently installed some new RAM into my PC (Corsair XMS2). It should be 4GB but when I view system properties it says that I have 4.00 GB (3.12 GB usable). Does this mean the memory I have is faulty or is it possibly a setting somewhere I have to change? I'm sure my motherboard (Foxconn 946GZ7MA) can use 4GB RAM. Any advice: would be appreciated.