Screen error at login

Hello every one,
i am new to Linux, i have just installed open SUSE 12.2 gnome.
but when it starts screen comes for login which has not proper graphics, when i login and desktop comes thats also the same then i have to logout agian and login back again then the correct display comes,
suggest me some thing
i guess this is may b the problem of graphics driver but cant say any thing
i am using nvidia GEforce 8400gs.
Is there any need to install its drivers or its any other issue :frowning:

> i have just installed open SUSE 12.2

run YaST Online Update and see if that fixes it…

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dd http://tinyurl.com/DD-Caveat