bunny678: A few questions:
1) Which CD are you trying to install from? I assume you're using the Ubuntu 8.04 Live CD.
2) You say that it "strucks [sic] where it begins". What does this mean exactly? Is the computer freezing up when you boot from the CD? Are you getting to a desktop, and double-clicking the install icon and nothing happens? Or do you getting to the end of the install process, the machine resets and then does not boot?
3) When the system sticks, what do you see on the screen? Do the mouse or keyboard work? If the keyboard does nothing, does pressing the Num Lock key toggle the Num Lock light on the keyboard?
Depending on the problem you are having, you may have more luck with the Alternate CD in some cases. http://www.ubuntu.com/getubuntu/download