HP Pavilion a762x install problems

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http://ubuntuforums.org – Looking for assistance on my problem. I have installed various Linux OS's on various computers. I recently tried converting over an old pc, it is an HP Pavilion a762x desktop computer. It had Windows XP and a 32 bit system. I downloaded the 32 bit Ubuntu, created the startup disk on my 32 GB USB, and tried to install it as I have always done. The USB ports on the Pavilion are 2.0, Ubuntu setup sometimes starts, and I always get the error message "this kernel requires an x86-64 cpu but only detected an i686 cpu". I have done countless hours of various solutions, searching for answers, (Hardware)