The appearance of busybox (she "swiss knife" for software engineers), is a sure sign that during the install a crash occurred, either because of failing hardware, or because of a serious bug (not very likely), or because the system ran out of memory (at least 512MB should work fine), or files on the install medium are missing (bad burn, or damaged .ISO file).

 Check that the CD works on another computer, if not its certain that the CD is bad.

 If your system has enough memory, try pressing F4 in the boot menu, and choose "safe boot", if that works you may have an unsupported video system.