i did a dual boot install vista/backtrack 4 os shown in the tutorial video.
when i completed step 4/7, the instalation proces directely whent to step 7/7 not letting me give in a login or password
i rebooted my machine
then backtrack asks me for login and password so i typ in
login: root
and when i come to password, i'am unable to typ anything!
so the only option i have is

login: root
password:

wich prompts me as invalid
and asks me to re-enter a login and password wich resulsts again in

login: root
password:

can somebody help me with this please?