How to fix USB not detected

Problem: Laptop cannot detect USB

Error in Device Manager: Both the VIA USB 3.0 Root Hub have a yellow exclamation mark

How to fix this problem

1. First, download this generic USB3.0 driver from this Lenovo website:
http://support.lenovo.com/us/en/downloads/ds029835
It says Intel USB3.0 Driver exe 4.89MB Windows 7 (32-bit) version 1.0.0.199 Released 18 April
2012. Just click Download Now.

2. After download, open Control Panel, click Device Manager.

3. Right-click each USB drive with an exclamation mark and Browse for the downloaded Intel USB3.0 driver to install it.

(a) If you tried the old VIA USB 3.0 Root Hub driver, it will return a Failed response.

(b) Try again and click on the recently downloaded Intel USB3,0 driver. This shows up as Generic USB Hub. Click it.

4. Repeat for each USB that has an exclamation mark.

5. Now check whether the USB driver was installed properly for each USB drive.

6. Push a USB device in the USB drive and check whether this USB shows up on the screen. It should.

7. Now check again. Open Control Panel, and click Device Manager.

8. The USB driver icons will not have the yellow exclamation mark anymore.

All done.