Ubuntu is different than windows, you can find your drives c:, d: or anything in Places, You have to just keep your mouse at left side at TOP panel, find your drives in Places menu. You may find drives name like 50 Gb, 100 Gb or anything like that. If you want give paricular name like System to C: drive Entertainment to D: drive. Reboot your system with windows and rename drive names by going to my computer, click particular drive, press F2 and rename drive. Reboot machine with Ubuntu you will find your drives with Names in Places.