[ubuntu] Ubuntu installation - Kernel error

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http://ubuntuforums.org – Hi, I'm trying to install the Ubuntu Server on an old Dell computer in order to host a website. I previously used WAMP-server on a Win7 environment, but I could only get my upload speed to 1/3 of what it was supposed to be. So I wanna try Ubuntu. Though, when I boot from the CD, I immediately get the error "This kernel requires an x86-64 cpu [...]". Now, I see that the solution to this would be to try the x32 version, but when I boot that one, I get the opposite error, that I need the version I previously tried. I don't remember the exact error messages, I'm not at home at the (Hardware)