Nothing on the screen?

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http://askubuntu.com – I have updated a presario 2100 from 12.04 to 12.10 and am now faced with a wallpaper only screen. I get the log-in screen just fine, but once logged into my account, there is only wall paper and a mouse cursor. No sidebar, no upper menu, nothing. Ctrl/alt/T opens a terminal windows and that appears fine. The updater popped up and I ran it. I also ran a sudo apt-get update in term. None of that has solved this issue. I also tried the crtl/superkey/d combo. This is a fresh new build so saving info is not an issue. I have used this DVD on 3 other computers w/o issue so I am a bit stumped here. Th (HowTos)