[ubuntu] 11.10 Questions

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http://ubuntuforums.org – Hi, I have an Intel Celeron 450 (single core processor) that says it's 64 bit in the specs. Can I run 64 bit version of Ubuntu 11.10? I'm confused by literature on the download page. I'm currently running 32 bit 11.10 with 500GB of free space and 2GB of RAM but things seem kind of lagging and slow... Anyone know if 9.10 or 10.04 are better than 11.10 or are they equally as buggy and weird? I used to run XUbuntu 9.10 a while back and it was pretty good. Anyway, I've been trying to run an ISO disk image on a DVD-R of 10.04 64 bit version but I can't get it to boot... I set the boot order in (Hardware)