server closed the connection unexpectedly

Hi:

I'm getting this error when accessing a table with certain WHERE condition:

"server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
The connection to the server was lost. Attempting reset: Failed."

I've read through the posts but found no answer to the problem.

When I "Vaccum analize" the table I get the same error.

I have droped and re-created the indexes.

Version is
"PostgreSQL 7.2.2 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.2
20020903 (Red Hat Linux 8.0 3.2-7)"

Any help on how to recover the table would be greatly appreciated.
Thanks, Ruben.