I have been trying to load Windows XP all evening and now into night. I take it through the last segment of steps - it starts at 39 minutes - installing windows - at 33 minutes it asks for my product key, regional options and area code and time zone. At 30 min it installs the network. And it shust down while installing the srat menu items. Now I have to start all over again - for the twentieth time. It has gone as far as 2 minutes before completion, but it never completes the entire install. I removed its 400 power supply and blew it out. I would have tried repacing it but all my other computers have a 250 watt power supply. Would it hurt to try a 250? What should I try next? Sandy New development: now when Setup continues inthe 39th minute (abot 30 seconds after it starts) I get a popup that says : Fatel Error - An error has been encountered that prevents Setup from continuing. Setup failed to install the product catalogs. This is a fatal error. The setup logs files should contain more information. Press ok to view the setup log file. The signature for Windows XP Professional is invalid. The error code is ffffdda. The system cannot find message text for message number Oxffffdda in the message file for syssetu.dll. Fatal Error.