Pegasus Mail & Mercury

I updated to the Win7-compatible version recently, and since then Pmail's been crashing a few times a day, always when opening a message.  Today, during a search, it crashed again, and now won't restart.  It goes through the motions but, when 'opening new mail folder' it crashes again.  I reinstalled the program to no avail, and I rebooted in the hopes it would help, but no go.

So I've reinstalled Pmail again, in the hopes or importing the old mail, but...  How do I do that?  Is there a better plan?  I'm really, really kind of screwed at work without my email.  

Any suggestions would be much appreciated.

Updated: 

I worked out how to get Pegasus to recognize all the old folders, and am now copying/re-indexing them into the new structure.  Hopefully this will continue to work.  ^_^

chriscw:

I noticed that lots of mail simply went missing when using 4.52 so I have gone back to 4.51.

What Windows version? Did you consider what's been discussed in the following thread?

dilberts_left_nut:

Have you got real time AV scanning on your mail files?

Still getting the occasional crash, but have completely re-done all my folders and have imported all the old mail.  Have discovered some rather fun features as well, like the autofilters...  Been using Pegasus for like fifteen years and I've only just discovered them!