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Probably you have 2 problems:
1. Check NLS_LANG key (parameter) in register, does it have valid character set (WE8ISO8859P15)
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It was “NA” but now I change it to WE8ISO8859P15 (on the Client). It doesn’t change a lot…

I have these parameters THAT I can get using Toad.

Session
NLS_CALENDAR = GREGORIAN
NLS_COMP=BINARY
NLS_CURRENCY=$
NLS_DATA_FORMAT=RR.MM.DD
NLS_DATA_LANGUAGE=PORTUGUESE
NLS_DUAL_CURRENCY= ? (Inverted)
NLS_NUMERIC_CHARACTERS=,.
NLS_SORT=WEST_EUROPEAN
NLS_TERRITORY=PORTUGAL
….

Instance

NLS_LANGUAGE=AMERICAN
NLS_TERRITORY=AMERICA
…

DATABASE
NLS_LANGUAGE=AMERICAN
NLS_TERRITORY=AMERICA
NLS_CURRENCY=$
NLS_ISO_CURRENCY=AMERICA
NLS_CHARSET= WE8ISO8859P15
NLS_DATA_FORMAT=DD-MON-RR
NLS_DATE_LANGUAGE=AMERICAN
NLS_SORT=BINARY
NLS_DUAL_CURRENCY=$
NLS_NCHAR_CHARACTERSET= WE8ISO8859P15
…

where is the NLS_LANG parameter show?

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2. Win NT (Win2000) has bug, copy-paste doesn'n correct if you turn on in ENG keyboard layout
(try turn on in YOU_LANG keyboard layout and exec copy-paste).
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I´m using the portuguese layout.... and it doesn´t work too!

Plese give me some more information!
tks!