What is the best way to read the Event Viewer to diagnose/pinpoint a freeze issue? For a while, it occasionally would only freeze upon waking from sleep. Now, for the first time, I have noticed it starts to freeze after reboot as well.

No new hardware has been added. Only software updates. Within the first 1 minute, if it doesn't freeze, then everything is "A" OK. Freezing only upon waking up, and now boot up as well.

Windows 7 64 bit and system encrypted