No longer able to login to admin

I have been using my laptop as well as my main computer to log into teh admin panel.

Now all of a sudden i am unable to login, it does nothing. It seems to be working then stays on login screen with no error messages.

I have a feeling my cat done something as she walked over the keyboard.

Anyone help please?

I'm not sure what this could be since working from 2 computers could not effect the admin login.

Is there a setting somewhere on Explorer that stops you from logging in?

I am able to login via mozilla firefox. On the same system.