Solution 1: Get the right port driver 

The possible reason why you meet with the issue could be that the computer has 3.0 ports while Windows 7 does not have a driver for USB 3.0 port. It can cause installation failure and make it impossible to use a mouse or keyboards.  

Cancel the installation and press Windows Key+R at the same time. Type “devmgmt.msc” and click ENTER to go to “device manager” on the computer. Expand the category at “Universal Serial Bus Controller” to see the USB driver you have right now. Or for an alternative way, go to the official manufacturer website of PC and find the type of computer hardware to look for the appropriate USB 3.0 driver controller. When the appropriate driver is located, download the setup file and extract the file into the USB installer. Start the installation again. 

Solution 2: Try a different port 

For users who install Windows 7 from a USB flash drive, this solution is effective. It has proved very work. When the notification no device drivers were found windows 7 appeared, plug out the USB flash drive from the recent port. Plug to another port that should be a USB 2.0 port. Click the “OK” button to shut down the notification window. Click the red close button on the right corner to cancel the installation. The screen will go back to the interface where you will ask to install Windows 7 from the start. Click “Install Now” to start the installation process. Repeat the installation instruction as before and choose disks as you need and click NEXT and wait for the installation end. 

Other Solution 

While it is hard to install with a USB drive, you can install Windows with a DVD. There is no need to buy a DVD at all as you can borrow from a friend and give it back after you finish the installation.  If you are still unable to solve the solution with the method above, you can turn to install Windows 8 or Windows 10. It is the alternative option to solve no device drivers were Windows 7 issue for your computer. Read more about Download Microsoft Teams All Versions, Microsoft To-Do Apk For Android.