That kernel error just means that the PC had a forced shut down. Not much help there. Were there any more under the system or application sections?
Go to the start menu-->type in chkdsk /r and press enter. Tell it yes to schedule a check disk on the next restart.
Also run a memtest scan.
Verify that you have the most recent NVidia driver.
If it continues, try running in safe mode with networking for a while to see if the problem persists. If not, it's likely a driver issue.