Oracle Database Discussions

Hi all,

Im very new to oracle but trying to learn i have just installed enterprise 11g on my laptop (XP) and while trying to login using:

https://localhost:1158/em/console/logon/logon

i am getting the error: Your username and/or password are invalid.

iv tried all my passwords i can think of, checked config files to see can i change or reset it but cant seam to find it!
iv also tried sys admin password blanks etc and no joy

can some tell me is there a default username and password? or

how can i set them?

thanks in advance