1. Insert the USB flash drive, open and run the USB flash drive production tool, and switch to "USB flash drive -ISO mode".

2. First, click "Generate ISO image file" and "Select advanced PE". After the generation is completed, click "Make ISO startup disk". After selecting your USB drive, click "Write". After the writing is completed, the startup disk is ready.

3. After the production is completed, copy the downloaded win7 system image file to the USB flash drive.

4. When the logo interface appears when the computer is restarted, press the one-button usb flash drive to start the shortcut key, use the direction key "↑↓" to select the option with USB words or USB flash drive brand, set the computer as USB flash drive to start, and then press Enter.

5. After entering the PE selection interface, select "02 WindowsPE/RamOS (new model)" and press enter.

6. Enter the PE installation tool, select win7 system image, and select "Target Partition" in the lower left corner, which is generally the default. Then click "Install System".

7. Start installing win7 system and wait patiently for 5 minutes.

8. After installing win7 system, restart the computer for final installation.

9. If you need anything, set it up quickly.