You left out the most important info--model computer.

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How to resolve USB port issues:

www.dell.com/.../en

That would help.  Dell Inspiron 5748

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I like to suggest you use the Troubleshooting tool on the system:

1. Go to Control Panel 

2. Look under System And Security, click on Find And Fix Problems.

3. On the left side, click view all

4. First, click Hardware And Device. If that one doesn't fix it, try Network adapter. If any of the window updates have fail or you are have any problems with window updates then click on the window update. Remember, any fail windows update could cause problems with the system.

I have checked under the Device Mgr and both controllers show the yellow exclamation mark.  I've updated the drivers.  I've disabled them and then re-enabled them.  I've deleted them and had the computer re-install on start-up.  Didn't help.  Bios is updated.  Ran the diagnostics and everything passed.  I specifically ran just the USB again and it passed.

Thank you.  I did try your suggestions but unfortunately, none of them corrected the problem.

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Please click on the link below to check for any warranty on the computer. If there's warranty, contact Dell at  1-800-288-4410 or if there isn't  a warranty contact Dell technical support at 1-800-624-9896.

Warranty Status:

www.dell.com/.../products;