problem with dlink DWL-G520

hi guys,

i've brought wireless adapter (DLINK DWL-G20 h/w ver B3, F/W ver 4.30) and install it according to the guidelines.

after the installation, I found out that the pc's getting lag whenever i play multiplayer games or single player games.

well, i have tried to system restore back and never have had lagged from pc during gameplay.

and now i couldn't able to play any games at all after installation of device. as i suspect, it might either due to the drivers or perhaps its own wireless adapter. i would really need help according to this situation.