Installing Oneiric after uninstalled with easybcd

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http://askubuntu.com – I had Ubuntu on my laptop a few days ago but a professional installed it for me. Soon after I got it from the guy I messed it up. I uninstalled Ubuntu with easybcd and now I'm scared it will complicate things. Does it? I'm sure I downloaded Ubuntu to disk on this site: http://www.ubuntu.com/download/ubuntu/download And got this file: ubuntu-11.10-server-amd64 which I burned to disk. When I put the cd in my laptop it shows me a wubi.exe file. When I reboot with the cd it boots straight to windows 7. What's wrong? Teach me (HowTos)