ubun2

I am a newbie to the Ubuntu world and just installed the 11.10 by UBS stick to run alongside my Windows Vista. In windows i had only 2 drives : C(250Gb) and D(30Gb). Now the installation of the Ubuntu went fine. I got 30Gb size for Ubuntu while partitioning and got it installed. 

Now Ubuntu is running ok, but Vista after choosing fails to load, just shows Blue screen for half a sec and then reboot again.