[ubuntu] WUBI INstaller First time installation username password error

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http://ubuntuforums.org – I have installed Wubi and then UBUNTU using this , During entering UBUNTU it asks for a user name and password, The one which i gave in WUBI are not working Also i have tried to enter into ROOT shell but have not been able to as there is not option to enter ( UBUNTU has not been installed yet ) THe options which i have are normal Safe graphics Demo ACPi (something i am not sure about this one ) PLease help as i have reinstalled this WUBI several times and every time it ask for the user name and password (Hardware)