Booting Ubuntu 12.10 from usb to fix boot manager and get the running in low graphics mode

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http://askubuntu.com – Ok, so I already installed ubuntu 12.10 a little while ago and while trying to fix windows (main OS) microsoft had me do the start up repair which erased or made the boot manager dissapear (not sure a little bit of a linux noob here). So i looked up instructions on how to reinstall it and when i went through the process and went to boot from the hard drive, the Grub 2.0 screen came up and has the GRUB> press tab for a list of commands thing and i have no idea what to do with that. After that i went back and booted the usb up agaain and after clicking try ubuntu it now comes up with "installati (HowTos)