You can make the USB by hand , using diskpart. We can tell you the commands if you need them. First you are going to need a computer with a DVD drive and at least a 4Gb USB.
Here is how you do it by hand. Put the Instal disk in the drive. If autorun starts close it. Put the usb in the computer. Click start, type cmd in the search box, in the cmd that appears, right click it and select run as administrator. In the window that opens type these commands exactly as you see them. You will notice the size of the drives and which is your USB. use the number assigned to your USB.and press enter after each one.
Type exit again and press enter.
Open computer and take note of the drive letter of the USB, Open the DVD drive, don't run it, just open it to see the files. Highlight and copy each one. Open the USB drive and click paste.
You now have a USB installation media.