The workaround is:
1. Download the Rufus: Rufus 2.8 Portable (865 KB)
2. Open up the Rufus, and insert USB (more than 8G) to working machine (make sure partition scheme and target system type is GPT)
3. Select ISO file downloaded and click start:
4. On the working system, download the Windows 7 USB 3.0 media creator utility from Intel:
*The download is a compressed zip file. Unzip the utility to a folder in Windows and then and run theInstaller_Creator.exe file as administrator (Right-Click the file, Select "Run as Administrator" on the drop down menu that appears).
5. When you are prompted, select the USB drive which includes Windows 7 installation source:
6. Click the "Create Image" button in the tool to start injecting USB3 driver into the image.
7. After complete image creation, Install windows 7 64bit with the updated Dell Windows 7 USB key.