dual boot win7 and ubuntu 9.10

I have win xp and then have win 7 on my laptop. Now I want to install ubuntu 9.10. But i want to install it on different partition. 3 days ago it got installed on the same partition where win7 was and it was a big problem. first it shows grub screen and then win 7 bootloader which has win xp also. I want ubuntu entry in win7 bootloader means it should show first win xp then win 7 and then ubuntu.
Could any one tell me how to do it? I am not very use to with linux and command line.