I am going to take a guess here and assume you are running both Web and DB on the same box.
Also please tell me that you are not using the XAMMP package for this. If you are then you need to switch to using Apache or IIS with MySQL installed and BOTH tuned correctly for a Windows OS. The XAMMP package is not for prod use, development use only as notated here;
http://docs.moodle.org/24/en/Windows_installation_using_XAMPP
Did you happen to have any type of logging system running when it crashed? I can only assume so much so please fill me in on what you are running.
JASON