Windows 7: Usb ports not working after new installation of win7

Hi all i have dell xps15z i suffered from problem usb device was not recognized and couldn't solve it by any solutions i found on the internet then decided to format and reinstall the windows i installed all the updates and drivers for my usb ports and all the computer but now usb device was not recognized disappeared but nothing now appear, whenever i enter any usb no driver or anything installed for it no windows driver appear or anything like the driver isn't sensing the usb or the driver isn't installed or sth but the strane thing that when i put usb it lights two times then the light disappear i tried that in 2 usb ports not one and same with any usb what can i do i know that it isn't a hardware issue so please help me i can't do anything please help this is urgent

Hi onoffonxhizors,

1. Please check the system BIOS to verify if the 'USB Ports' are 'enabled'. You may find the following steps useful:
- Power off the laptop > Power it back on and at 'Dell splash screen , repeatedly tap 'F2 key' > Use 'arrow keys' on the keyboard to navigate to the option 'Advanced' > Navigate to 'Miscellaneous Devices' > 'Enable USB' > Tap 'F10 key' to 'Save Settings' (Refer to the images below)





Alternatively, you may tap 'F9 key' to 'Load BIOS defaults' and 'F10 key' to 'Save Settings & Exit'

2. 'XPS 15z/L511z' has 2 'USB 3.0 ports' on the 'left side' (Numbered 4 in the image)


If the issue persists, it is likely that 'USB 3.0 Host Controller' is missing. Use the following link to install it and check if the ports work: Driver Details | Dell United States

Hope this helps. Do reply if you have any further questions. I would be glad to assist.