my router is d-link i used to access it to change setting using my laptop but now i cant access my router anymore.i tried many computers but it keeps displaying the main page everytime i enter the password "admin".
any help please
It sounds like you (or somebody) changed the password for the user admin. You can reset to factory defaults by depressing the small button in a hole on the back of the router, you will then need to reset all values.
It depends on your specific model but the default is usually user: admin PW: either admin or <none>.