When my game crashes where and what do i look at to see a report?

My Documents\My Games\Skyrim\Logs\Papyrus.log

The log is a script log rather than a crash log, and isn't usually useful to determine direct cause of CTD, which is often engine or memory-related rather than script-related.

Papyrus log is really for troubleshooting scripts and seeing if you're getting a lot of script spam that could be contributing to slowdown which could eventually leading to performance issues and crashes.

The Papyrus logs, as talked about, are for Mod Scripts and figuring out where mod related issues are happening.

For general game crashes, you want the Event Viewer

http://windows.microsoft.com/en-US/windows7/Open-Event-Viewer

Once you get it open, you have to poke around in the directory of the Viewer to find the log for the App Crash.