[ADMIN] best way to revert back to 7.3.3?

[Rob Long]

Need a hand.  Was running 7.3.3 with several databases on a 
windows/cygwin platform.  Recently downloaded/installed 7.4.5-1 from 
cygwin.com without first dumping my 7.3.3 databases needed for the upgrade.

Have to go back to 7.3.3 and dump the databases.  Tried installing 7.3.3 
from source, configure, make, make install all succeeded.  Without doing 
initdb, 7.3.3. data directory still in original place, I tried starting 
postgresql but got:

IpcMemoryCreate "Function not implemented"
This refers to the ipc daemon but it's verified running.
Any ideas?
Thanks,
Rob

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