I have clearly seen v2r's link. thanks for your help too. But my problem is different. I am trying to dual boot windows and ubuntu after installing with wubi. I DOWNLOADED AN ISO, BURNT IT AND CLICKED WUBI.EXE IN THE CD. I suspect that wubi hasn't put a list in boot manager. because i don't see ubuntu in boot manager or msconfig in WINDOWS.
It is after these repeated failures i tried to install ubuntu by booting into my cd. but i was taken aback when it gave me no option saying "install with windows".this was mentioned in all tutorials. so i had to chose "something else" in the setup dialog. Then another problem came up --- I wasn't able to install inside any ntfs partition. It showed : "no root file system defined". I had to quit.
So i would like to know a SOLUTION. i beg you to help as i love ubuntu. PLEASE:-)