Install GIMP or GIMP Portable.
Go to the Ghostscript project page on Sourceforge http://sourceforge.net/projects/ghostscript/
Download one of the prepared Windows distributions, such as gs870w32.exe
Start the executable and follow the instructions for the installation procedure.
Right-click My Computer, and then click Properties.
Click the Advanced tab.
Click Environment variables
Set the GS_PROG environment variable to the full file name of the gswin32c binary (e.g. C:\gs\gsX.YY\bin\gswin32c.exe).
Open GIMP and open the EPS file.
