Neil, I have been getting similar things from VFP 6.0. I'm
redoing a V2.5 application, but without converting any code
at all. It's a whole new GUI and a new DB, files, forms, and
I hope to have printed output someday too. It's been crashing
when I modify reports, labels or forms, and when I add them
to the project. Especially reports & labels for me.

This forum has been helpful but I haven't resolved the basic
problem except to work around it. There are some reported
problems with Video drivers and HP printer drivers, but I don't
have any of the drivers listed. MS has some info on their site
at http://msdn.microsoft.com/vfoxpro/technical/support.asp but
if you click on 'Issues List' it looks like they don't think
they have any bugs. But if you select search from that page,
and select 'all words' and click the Knowledge Base/Support button,
and search on [Visual FoxPro 6.0 C0000005], it shows six links,
including one about handling forms.

I don't know if you're getting what I got from VFP6, but I have
seen C0000005 a few times. And VFP has scrambled my FAT tables,
the indexes to the hard drive contents. If you run a scandisk
and UNcheck 'Fix Errors Automatically', it will show you just what
files (if any) are indexed wrong. I had trouble mainly with files
I had handled shortly before crashing. The errors I got were cross-
linking (it thought one file was in several folders), files that
were a different size than what was recorded in the tables, and
more than one file indexed into the same spot on the disk. This
happened when the machine froze. I'm scanning every time it gets
flaky now, and I'm restarting FoxPro at the slightest sign of any
erratic behavior. {Or perhaps behaviour.}

Good luck

-- Bob