>Is it possible to find the source of C0000005 errors? A client is getting these errors on three of their five machines. We are using VFP 6, SP5.
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>Perhaps there is a document describing how to troubleshoot these types of errors?

There is a very good document at the Fox Wiki on this. But the site is down for a few days.
http://fox.wikis.com
Should be back up in operation shortly.

Your problem could be related to faulty/obsolete drivers (printer, video, NIC). What id different in those three machines? A C005 error is just a GPF. Windows way of saying it cannot deal with a problem.

Does it always happen in the same spot or line of code?