Dell Inspiron 15R SE 7520 freezing upon turning on wireless.

Hello, this is a weird problem,

whenever I press "fn+f2" key to turn on wireless/bluetooth it gets turned on and within 5 seconds the computer (windows 7) freezes to death.

There's no scope of doing anything, no task manager or anything. I have to turn off the wireless again by pressing "fn+f2" and then reboot the laptop by pressing the power button, so basically my laptop only works with a wired connection now.

This has happened since I transferred some files from my dell laptop to a friends lenovo laptop via bluetooth. Anyone with some help ?

Thanks.