for my lap while installing bluetooth driver it is asking activate bluetooth using wireless switch in os win7

We need more information such as the model of the Dell and more importantly the hardware ID of the wireless cards?

See here for more details:

http://dellwindowsreinstallationguide.com/downloading-drivers-checking-hardware-ids-and-downloading-and-installing-dell-system-drivers-in-the-correct-order/checking-hardware-ids-in-the-device-manager/