recording with Sonar 3.0. my Pc turn off and restart!!!

[galileopop]

Great hug from Argentina!
I own a Pulsar 1.3, with software updated to Scope 4.0, and I have
a problem recording to HHDD with Sonar 3.0 and Windows XP.
In effect, everytime i am preparing an audio track for recording,
when i pick up to check the recording box of it, my PC turn off
and restart at the moment. Always; everytime.
Playback is ok, in audio or midi. Please, can you help me?
Thanks a lot!
Diego.