If you have a programming cable (USB-JTAG):
ISE Project Navigator relies on an old version of Java. On Windows 10, you will likely see "java not found" even if Java is installed. download and install xilinx ise 147 windows 10 top
"Code is fine," you muttered to the empty room, scrolling through your Verilog file for the hundredth time. "The synthesis is lying." If you have a programming cable (USB-JTAG): ISE