hello everybody

i just switched to BT5 yesterday and i really enjoyed it
but i have a problem

i used to run win7/ubuntu11 in dual boot and i have decided to use only BT
i load it to a usb and install it normally
at the hard disk screen , i choosed to install it at the entire desk (option 2)

everything is fine and i had a wonderful night customizing BT and i shutdown the pc before sleepig
when i open it again , i go the same win7/ubuntu Dual boot scren again as if i never installed BT
i restarted the machine serveral times and finally i got BT booted

any idea what is going on here ?