One or more of these guides may help, depending on exactly when the problem occurs:
[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 (if it is crashing, not just freezing)[/li]
[li]General slowdown or instability investigation steps (if none of the others seem relevant)[/li][/ul]