When installing, if I select MS PS2 intelimouse (I have one) I have a problem when it test my X configuration during install. The problem is that the mouse will stay towards the top right of the screen. If I select that I have generic mouse, I have no problem. I have an ATI video card. If needed, I can yank my box apart for exact model #.
This issue should be resolved in the next cut of the release. There was a known bug in the code which has been fixed. Please reopen if you continue to have problems with the official release.