[wubi] Ubuntu shows windows username?

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http://ubuntuforums.org – i am posting for first time, sorry if this is not the right place... i have windows 7 username "lolax" and no password... i installed ubuntu 12.10 in d drive using wubi...(inside windows which can be uninstalled from control panel) when installing it asks username and password, i entered "tanmay" as username and some password... and then installation started... after the installation there was only 1 username of ubuntu "lolax" and the password was exactly which i wanted... i tried to add user "tanmay" but it says user already exists... plz he (Hardware)