|Two places to start. |
One is event viewer logs and the other is dump logs.
They may or may not show anything other than you having to crash it so be sure to notice times exactly.
The other idea is to look at bios. Most times there is health information that may help.
Then it goes into diag software, might start with memtest.
"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10