Serious Erro

Someone please help!!!!!!

My computer switches itself off, when it comes back on it says this has recovered from a Serious error, these are the error messages im getting.

BC CODE: 19 BCP1:00000020 BCP2: FEBC5330 BCP3: FEBC55DO BCP4: 0A540001

OS VER: 5_1_2600 SP: 2_0 PRODUCT 768_1


BC CODE 19 BCP1 00000020 BCP2: FEB59350 BCP3: FEB595FO BCP4: OA540002

OS VER: 5_1_2600 SP:2_0 PRODUCT 768_1

please help, what is causing this to happen, its never done this before, and its a new pc.

HELPP!!!!!!!!!!!!!!!

Thanks Helen