Getting iPhone & iPad Crash Reports on a Windows PC:
Sync the iOS device with iTunes, then look in the following locations:
Windows XP: C:\Documents and Settings\USER\Application Data\Apple computer\Logs\CrashReporter\
Windows Vista & Windows 7: C:\Users\USER\AppData\Roaming\Apple computer\Logs\CrashReporter\MobileDevice\
Search for the appropriate device name, then look for the file by app name and time stamp