I cannot install Ubuntu on my laptop running Windows 8

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http://askubuntu.com – I installed Ubuntu 12.04 (ubuntu-12.04.1-desktop-amd64.iso) to my 4GB USB Sandisk drive so that I could install it on my laptop. I was able to get to the setup but when I would get to the part where it would ask me if I want to replace Windows or install next to it I chose to install next to it and then it would restart the computer. I wanted to try using Wubi.exe to install it from Windows but I'm afraid to do that since all it says for destination is C: which is the place I use for Windows 8. I can run Ubuntu off the USB stick but I'd like to install it next to Windows 8 so that I can dual-b (HowTos)