Hi Im new and got a problem

Installed BT4 on my usb but when trying to look for wifi networks using WiCD Network Manager its not starting up and when trying to switch on/off my wifi on my laptop nothing happens eaven the led not on. But WIFI under Windows7 works fine. Ive gor Sony Vaio VPCW12S1E can someone help me pls. If yo can drop me a line on tr1984@live.com