problem with character set using 10g

hi i have install oracle 10g Enterprise Edition in win xp. Now i want to insert some character like (alt + 0138 i.e Š)in the table only. The font used is Type New Roman
my sql command is:

insert into description(descid,desc) values (10,Š)

it inserts the value all right but when i see the values using select statement it displays some other character.Some other character also shows same problem. I want to display Š as it is. Could some one help me???????

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