Cannot change sga or pga value

Hello,
i've got a problem with changing the sga or pga values on oracle xe installed on windows xp.
When i log on to the administration page, set a new sga target, restart xe and go to the page where i can set the sga target size i still see the old values. My new values are not set.
What can i do to change the sga target value?
Thanks for help in advance,
Dirk

You don't need to restart instance when you set new value.
If you want to have that value permanently (I wouldn't) then you must change initialization parameter.
E.g.:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/start.htm#sthref512
HTH

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