Try these guides, as applicable, for the best suggestions on tracking down the cause of the crash (usually a shell extension or video codec). They come from the "Other Troubleshooting" section of the Opus FAQs.
[ul][li]Crash, exit or high CPU usage when viewing certain directories[/li]
[li]Crash, exit or high CPU usage when right-clicking certain files[/li]
[li]Crash dumps for bug reports (try the other things first; and you'll also need to link your account if you want us to look at them)[/li]
[li]High CPU usage or other problems with AVI files[/li]
[li]General slowdown or instability investigation steps[/li][/ul]