Weird problem with Zyxel router

Okay, let me tell you the story

I have a Zyxel 650H router on 2 computers. both windows XP and they have always worked fine for months.

but, suddenly i couldnt login my router setup anymore. i type 192.168.1.1 in my browser as i did for months long. and i get the login window...

i type as username : Admin and password : 1234

which has, by the way always worked fine for months. but suddenly, it doesnt work anymore. i just get 3 try's and after that it shows :

Protected Object
This object on the RomPager server is protected

this is really weird since i never had this until now, i tried restarting the computers and the router but with no luck.

if anyone has a solution to this problem (apart from resetting the router which im affraid to do due the trouble it caused when i first installed it) please let me know.

Thanks a million!

Frigz

 

Please i really need help as fast as possible.