[ubuntu] Installation proble

Hi all,
I have formatted my USB and used http://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3 to boot usb..
then i set boot option 1 as usb and i restart......it asks me to choose whether i want to install along side windows7 that i already have or i just want to go with ubuntu....when i choose 1 st option it says continue....when i click on continue ....then it says system is going down to reboot.......but after it restarts....it doesnt reboot and it goes through same steps it has gone earlier asking me again whether i should go installing ubuntu along side windows.....etc...i have tried to do this 15 times...and same every time..


please help me....


thanks