Zeroing single tuple in data file.

Hello,

I have a problem with one of the tables in my database. The thing is
that one of the rows is present in corresponding data file yet I'm
unable to perform any actions on it including simple SELECT statement.
Is there a way of deleting the tuple from the file by zeroing it and
then reindexing the table. I tried other ways of dealing with the
problem like vacuming and clustering the table but it pops out the
error and terminates when processing the given row. I have several
data folders so when I find the exact error message I will post it.

--
Łukasz Brodziak
"What if everyting around You isn't quite as it seems,
What if all the world You think You know is an inelaborate dream
When You look at Your reflection is that all you want it to be
What if You could look right through the cracks
Would You find Yourself...... Find Yourself afraid to see"