CANNOT USING XWINDOWS AFTER UPDATING TO 9.04

[Da Liu]

Hi, everyone.
I am a real noob.
I can just only use the GUI of buntu, I do not familiar with CLI. But I love
trying linux indeed.
8.04 used to work well. however yesterday I tried 9.04, faild and cannot
login.
When I start the computer, the Welcom splash messed up and I cannot
recognize where I should type the user name and passwd.
So what should I do, if I want to go back to 8.04?

Thank you all in advance!
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