Won't Start After Registry Mechanic

I ran registry mechanic V5 on my office XP machine. It ran smoothly and when I chose compact registry and it finished, it asked me to restart windows, I accepted, and it restarted, after the windows logo, the screen goes blank (black) and does nothing, I restarted again, and chose last working config, the same thing, screen goes blank, and when I restart using any of the safe mode configs, the screen not only goes blank, but there is a blinking cursor on the upper left corner,

I tried to run a Repair install of the Windows XP CD, but, I don't have the "R" option in there, only "ENTER" to Install, "D" to Delete the currenyt partition or "F3" to exit. I don't know how to work with the Repair console I also would want to know what happened if there was no error reported