I tested my computer with the otherone wired, and i set my network adatper's parameters: (these settings were the bests. the speed of copying was about ~10.5mb/s with an old UTP cable and a new CAT5 cable)
VLAN: Disabled
Flow Control: Enabled
Jumbo Frame: 4KB MTU
Speed: Automatic Speed & Duplex
After this, i disabled the wired lan on the other computer, and enabled the DWA-547.
It was still about 0.8mb/s.
I disabled WISH, QoS, WPS, and set the Wireless Encription to none the 801.22 mode to g and n, and the speed was ~10.5-11.14 mb/s. (It's still really slow for a 300mbps connection.)
After, i turned on WPA /AES encription. The speed dropped to 2.3-3.0 ~mb/s.