Sly schreef in news:422ee8e6$0$31496$5a62ac22@per-qv1-newsreader-01.iinet.net.au

I recently changed ISP (and email address) and I need to recover my
BOINC account key...any ideas how?

There's no Boinc account key, but there are project account keys.
Every project you're subscribed to sent you an account key.
Look in \Program Files\Boinc for a file named account_setiweb.ssl.berkeley.edu.xml.
It contains the account key for the Seti at home project.