Help, the computer does not see the RAM!!!

Hi all, please tell me I'm worth - GR800D264L6 / 4GDC 2 x 2 GB 128x8 DDR2 DIMM Dual Channel 800 MHz 6, put another GR800D264L6 / 2G 2 GB DIMM 128x8 DDR2 800 MHz 6, but now vindows available 4GB and 6GB installed, in the BIOS the total memory is 4096kb in msconfig beaten, BIOS reflash, module, working , strap places as I could and changed baterako was vicarial, BIOS parameter with the name of the following or similar could not find , reflash BIOS again.
Memory Remapping
DRAM Over 4G Remapping
H/W DRAM Over 4GB Remapping
H/W Memory Hole Remapping
Hardware Memory Hole
Memory Hole Remapping
Memory Remap Feature
Inwhat else can beat the problem??what to do???
I have:
Windows 7 Ultiamte x64
Mother - Gigabyte ga-ep41-ud3L Rev. 1.2,
percent. - Intel core2duo E7500(2.93 GHZ),
video - nvidia gt640 2gb.