Running BOINC 4.19 on an Athlon 2800, 1 Gig RAM, Windows XP SP2 (en). It either froze (CPU usage drops to zero) or even crash when processing CPDN units. Other projects are running fine.

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Welcome to the project Krohon.
There are a lot of reasons that cp crashes, but the main ones are heat and overclocking.

There are 2 text files, (to start with, 4 later), in the BOINC folder which contain the messages you get:
stdout for the messages you see in the gui under Messages, and
stderr for the error messages.
When these get re-written, (when you re-start BOINC), the .txt is renamed to .old, and new .txt files created.

If you look in these, (just double-click), you may get a clue.
If not, repost with a copy of anything relevant in the file(s).

Les