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I'm using an Acer Aspire v5-471 PG Touch.
Intel (R) Core(TM) i5-3337U CPU @ 1.80GHz
System Bios V2.13
NVIDIA Optimus
Windows 8 pre-installed

I installed Ubuntu 13.10 on it and after running boot repair and restarting the computer this is what appeared on my grub menu:

Advanced Options for Ubuntu
Windows UEFI bkpbootmgfw.efi
Windows Boot UEFI loader
Windows BootManager (UEFI on /dev/sda2)
System setup


I tried all the options but it will only display Error: cannot load image.
Booting using Legacy Bios and disabling secure boot, will show a screen Operating System not found and some gray text on a black screen about some patent about Intel??(not sure).
And another thing, when I use Ubuntu I can't adjust the brightness, my laptop overheats and consumes too much power. The battery gets drained after an hour. When I used windows 8 before I can use it up to 3 hours.

So to sum it up I need help on 1) Booting back to Windows 2) Repair overheating and power problems.

I just started using Ubuntu so I hope you could explain it simply.

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