I've just install BT5 32 bits KDE onto an existing Win 7 Dell Inspiron 15r, everything went perfect (from installation to dual boot) but it happened twice already (in less than an hour) than when I'm using the terminal with kismet or airdump open my computer freezes and I had to force shutdown.
It's a fresh install, I don't even had the time to change the root password so everything is default.

My laptop specs are:
Intel i5 m460 @2.53
4GB ram
DW 1501 wireless-n wlan half-mini card
ATI mobility radeon hd 550v

Thanks in advance.