Repeated BSODs

Over the past week I have been getting several BSOD restarts. I downloaded SP1 (running Vista), but it happened again today. I do not have the right program to read the .dmp files, and when I tried to attach them it wouldn't let me. The error codes from before the SP1 install were:
BCCode: a
BCP1: 00000004
BCP2: 0000001B
BCP3: 00000000
BCP4: 81CB1F60
OS Version: 6_0_6000
Service Pack: 0_0
Product: 768_1

and the codes from today were:
BCCode: 19
BCP1: 00000020
BCP2: 83FA3F58
BCP3: 83FA3FC8
BCP4: 080E0002
OS Version: 6_0_6001
Service Pack: 1_0
Product: 768_1

Thanks in advance for any help!