First of all, if you never read the installation instructions, start with that. Without downloading the external dependencies mentioned in the installation instructions, you will not be able to run openBVE at all.

The homepage also contains a troubleshooting section for the most commonly encountered problems. Please check this page first before starting a new thread.

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Furthermore, the following threads cover commonly encountered problems. Please do not start a new thread for any of the problems listed below.

The application failed to initialize properly
http://openbve.freeforums.org/error-the-application-failed-to-initialize-properly-t1210.html

Unable to find an entry point named <something>
http://openbve.freeforums.org/error-unable-to-find-an-entry-point-named-alspeedofsound-t995.html

Attempted to read or write protected memory
http://openbve.freeforums.org/error-attempted-to-read-or-write-protected-memory-t969.html

No string associated with token
http://openbve.freeforums.org/error-no-string-associated-with-token-t972.html

Blue Screen Of Death (BSOD)
http://openbve.freeforums.org/blue-screen-of-death-bsod-t1089.html