This one is going to be a real quick one.
If you RSLogix ever crashes, the error logs are all kept in the following folder.

Log file
C:\Documents and Settings\All Users\Documents\Rockwell Automation\RSLogix 5000\Logs

Or

C:\Users\Public\Documents\Rockwell Automation\RSLogix 5000\Logs

Xybernetics Allen-Bradley RSLogix - Log File Location