sql prefix problem – help me please :(

hello all..

i’ve installed a fresh wp on my site. i selected sql prefix as default. but after that i upgraded it from wp_ to wp2_..

at the beginning i just can not enter to the wp-admin. it shows this error;

you do not have sufficient permissions to access this page.

after that i found an article about fixing it which name is “force-upgrade.php”.

now i can login to the panel but i’ve a problem about menus. it just shows dashboard ??

here is the screenshot:
https://img155.imageshack.us/img155/7186/dashmp1.gif

how can i fix it? please help me ??