First, select the design phase where you have a question or are troubleshooting an issue related to your configuration solution. This ensures that the Configuration Design Assistant points you to the information you need to continually move forward with your design.
(Xilinx Answer 37251) iMPACT Release Notes: In each major software release there are new features added and critical fixes made. The Release Notes outline these new features and fixes.This section also contains information about downloading and installing the "Complete Programming Tools".
(Xilinx Answer 37252) iMPACT Error Messages: The following are common errors that can occurwhen using the software. These articles provide guidance to resolve these issues.
(Xilinx Answer 37253) iMPACT Usage: This section details the significance of different operations in iMPACT and outline the debugging steps if each operation fails.
(Xilinx Answer 37254) PROM Files:These articles detail how to change a ".bit" file into any required PROM file format.
(Xilinx Answer 37255) System Ace CF: These articles provide useful debugging information for use with the System ACE CF tool.
(Xilinx Answer 37256) Cable Support: This information helps when debugging cable operation is required.
(Xilinx Answer 37257) FPGA Device Specific Issues: These articles are based on specific devices or solutions.
If you are confused on where to start your debug a good option could be to start with the Configuration Debug Guide:
http://survey.xilinx.com/ss/wsb.dll/Xilinx/Configuration_Debug_Guide.htm