Can't read some national characters.. instead $..&.. please help!

Hello Gurus,
How can I read national characters?
There is a table imported from mssql database and when I run a query it doesn't disply national characters.. instead it displays symbols like that... $.. etc..
Do I have to change characterset (which, how?) or nationalcharacterset to do that, or is there an other way?
Please help me understand this because it is confusing..
Regards!!!

Try setting NLS_LANG environment variable on the Client. Do the following :
SQL> select * from nls_database_parameters
2* where parameter in ('NLS_LANGUAGE', 'NLS_TERRITORY', 'NLS_CHARACTERSET')
SQL> /
PARAMETER                      VALUE
NLS_LANGUAGE                   AMERICAN
NLS_TERRITORY                  AMERICA
NLS_CHARACTERSET               WE8ISO8859P15
SQL>                                                                             then at OS level set NLS_LANG as follows (Linux syntax) :
$ export NLS_LANG=AMERICAN_AMERICA.WE8ISO8859P15
of course change values with yours. On Windows :
C:\> set NLS_LANG=AMERICAN_AMERICA.WE8ISO8859P15

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