Hi
Does the notebook supports fingerprint reader?
If yes, you should check this:
Intermittend hang up or freeze of your machine (with possible high rotation FAN) under Windows 7 - 32 Bit / 64 Bit
http://aps2.toshiba-tro.de/kb0/TSB0C032L0000R01.htm
In such case its advisable to update the fingerprint driver/software