VS 2010 Logging into my router with VB

Hi Guys, I'm trying to log into my router using VB. I created a form and added a web browser and navigated to the the log in page. The problem arises here, the actual log in is a popup msgbox with username and password. Can anyone tell me how to input data into them? I tried using sendkeys but some times it may miss certain keys depending on how fast the page loads. I tried using ReadyState and waiting till the page finishes loading but it freezes the program.
Any ideas?

Thanks in advance for the response!