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Lenovo c30' s host wants to reinstall win7 system with optical drive, but it can't find a signed device driver. What should I do?
Operating steps for installing win7 system:

1. First, make a U disk with the U disk startup disk making tool. Then insert the U disk startup disk into the usb interface of the computer, press the startup shortcut key to enter the U-deep main menu interface, and select Run win8pe menu to enter.

2. After entering win8pe, the U-deep pe installation tool will be opened, and the prepared win7 system image will be installed on drive C. Click OK.

3. The program will perform the recovery operation, select the "Restart after completion" check box, and then click "OK".

4. Prompt to restart the computer after successful recovery, and click "Yes".

5, after the program installation process, just wait.

6. After the installation is completed, we can set up windows, and then we can use win7 system normally.