This typically occurs when the installer is not created in the correct structure and the installer cannot find the ".idata.bin" file it is looking for. If you have downloaded the product from the Xilinx Web site, please ensure that it was extracted with the folder structure intact and there is an ".idata.bin" file in the idata/ folder at the top level.
If you have attempted to burn a DVD with the product on it, ensure that your burned DVD also has the correct structure and that the ".idata.bin" file was burned onto the DVD. Some DVD burning software might assume that .* files are hidden and not burn them.
Finally, check to make sure that the path to the Installer does not have spaces in it.
This issue can also occur if the MYXILINX environment variable is set. Please temporarily disable this environment variable before launching the installer.