Hi, I have a Dell Dimension 4100. Was having problems so I tried to re-install the operating system (Windows 2000) from the CD that came with the Dell. Chose option to upgrade OS instead of clean install. Now everytime I get to the scree that says performing final tasks (registering components) the computer freezes. If I shut down the computer manually when I turn it back on it prompts me to run OS cd again and goes through a series of steps until it get to the same screen again and hangs. How do I resolve this problem. Better yet how do I even get to something else when I start my computer. Any help would be greatly appreciated. Thanks, Candy