General Description: While installing 2.1i after 100% of the files copying have just completed, this error may show up indicating a problem processing the environment. It will then ask you to abort install and click yes to erase what has been done.
Solution
Reinstall the software but deselect the options to edit the environment (XILINX variable and Add Xilinx to Path). Manually add these in if they are not already in the environment ensuring the path resembles: