I have installed Ubuntu 14.04 using Live USB. I installed ubuntu in a totally empty partition with ext4 file system. Now when I restart the computer the loader takes me directly to windows 7 without giving me an option to choose ubuntu or windows. when I insert the USB drive and restart the computer a weird red screen appears when I boot from the USB with a term GRUB in a few lines. And it gives me option that i dont know anything about like load windows with SLIS or Load Windows without SLIS or something. When I go into windows the partition that i installed ubuntu in is totally vanished.I am able to use the try ubuntu
option through which I have a access to Ubuntu O.S.
Please HELP me