invalid byte sequence for encoding "UNICODE":0xa1

Hello,

For my database ( PostgreSQL 8) I made a backup (
using pgAdmin ). Now when I try to restore the data (
again using pgAdmin ) at some point the process is
aborted:

-----------
pg_restore: ERROR: invalid byte sequence for
encoding "UNICODE":0xa1
CONTEXT: COPY ...............
pg_restore: [archiver(db)] error returned by
PQendcopy: invalid byte sequence for encading
"UNICODE":0xa1
CONTEXT: COPY ...............
pg_restore: *** aborted because of error
Process returned exit code 1
-----------

If I delete the database and restore only the
schema I get this message:

-----------
"WARNING: errors ignored on restore:21
Process returned exit code 1"
-----------

The designer of database has told me that this last
message is OK, and this is the message which should I
get after restoring the schema and data.
I have asked him why I can restore the data but
unfortunatelly he doesn't now where the problem is.
The database is installed on a server with Windows
2003 .

Can you please help me?

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