[xubuntu] Unrecovrable error

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http://ubuntuforums.org – I wanted to install Xubuntu on a old computer, a 850Mhz Celeron with 512 Mo ram. I have tried to install it but I got a message :" The installer encountered an unrecoverable error..." Then it started a live CD desktop session so I could investigate the problem But I don't Know what to do. Then I have tried to install Lubuntu, from the CD I could test the memory and the CD. Both were good. But the installation just froze in the middle. Should I try an another distro? (Hardware)