Login Problem in Opera 10.61

[hamidhamid1985]

1) I have followed installation guides step by step and installed Pligg 1.1.1 and when i register, and after registering i enter username and password in Opera 10.61 i don't enter to site and still it needs username an and password Also i don';t see any message to enter user name and password again.. But it works fine in all other browsers.
2) Also when i enter mydomain.com/admin/admin_index.php i see the error that this page does not exist but when i enter mydomain.com/admin/ it works true. Please help me in this issue too.
Please help me.

[hamidhamid1985]

Problem has been solved.
Thanks from all members helped me