USB Thumbdrive causes "Mass Storage Device Not Responding"...

Everytime I connect a thumbdrive to my MBP, I cannot eject it. I always get the "disk in use" message.
When I go into Activity Monitor, I see "Mass Storage Device Not Responding" and it's eating up a lot of system resources.
After a short period of time, the fan will come on full blast, and stay on until I force the program to quit.
The only way I can eject the thumbdrive is to force quit through Activity Monitor.
I've tried multiple thumbdrives on every USB port and I get the same result.
I've searched through the Support site, but haven't found a solution.

Hi @Eman_Gamal 
Welcome to the HP Forums!
It is a terrific place to find answers.
For you to have the best experience in the HP forum I would like to direct your attention to the HP Forums Guide Learn How to Post and More
I grasp that your USB ports are no longer functioning correctly.  When you checked Device Manager under device status you see this message" cannot verify the digital signature for the drivers required for this device".
As they were previously working have you tried rolling back the drive in Device Manager?
Have you ran the   HP Support Assistant  to acquire any HP updates?
Have you tried using  MS Fix it ?
Here is a link to the recommended drivers for your notebook.  HP Pavilion dv6-6c45se Entertainment Notebook PC Drivers Please ensure you have all the latest updates installed.
If the above has not helped as it was previously working you could try a restore back to a known good date.
Using Microsoft System Restore (Windows 7)
Lastly you could do a recover back to factory.
Performing an HP system recovery (Windows 7)
There is an opportunity during the recovery to backup your personal files to prevent data loss.  Now is the time to do one if not previously done.
Restoring Files that were Backed Up Using HP Recovery Manager (Windows 7)
At any time you may contact HP support for assistance. They can remotely access your system tto help you overcome difficulties.
Please call our technical support at 800 474 6836. If you live outside the US/Canada Region, please click the link below to get a support number for your region.
World Wide Phone Support
Good Luck!
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

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