Billt4g,

Dell has Windows 10 drivers for the Inspiron 5555 at the link before.

Inspiron 5555 Drivers, Downloads and Manuals

billt4g

I found some information about partmgr.sys.

The process known as Partition Management Driver or Partition Manager belongs to software Microsoft Windows Operating Systemby Microsoft (www.microsoft.com).

Description: The original partmgr.sys is an important part of Windows and rarely causes problems. Partmgr.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 19,712 bytes (42% of all occurrences), 18,688 bytes, 53,120 bytes, 54,248 bytes or 49,256 bytes.  
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. The file is a trustworthy file from Microsoft. There is no detailed description of this service. The partmgr.sys file is a Windows core system file. partmgr.sys appears to be a compressed file.

You can try the following information to see if that will resolve the error.

A unique new feature of Windows 8 or higher is the ability to repair all Windows components with the DISM command. This will save you the work of reinstalling Windows. If you use the /ScanHealth parameter instead of /Restorehealth, you can just check your computer's health.

Run the command DISM.exe /Online /Cleanup-image /Restorehealth

Since the error started after the Windows 10 update you may consider uninstalling the update. There are reports of this update causing issues with some systems. 

Billt4g,

It appears that the kindle could be causing the problem since the problem only occurs with the kindle plugged in.

BILLT4G,,

Dell does not have any driver for kindles. You can uninstall the update to see if that will resolve the issue,

Hi, thanks for your suggestion, unfortunately when I used  the link it replied;

"No driver updates found. Your system has the most recent updates", So can you think of anything else I could try to fix my problem?

So, it seems that as "partmgr.sys" is a Trusted Microsoft file, and therefore not the problem. It must be some other driver..

I ran DISM.exe /Online /Cleanup-image /ScanHealth but this indicated that there were no problems!

I have pretty much concluded that this problem only happens (As it did again today) when I plug in my Kindle. Odd though, I use the same USB port & cable to charge my Phone, and nothing happens then!!

What I ask myself is different between the two?? could this point in a direction to search for an answer??

Any thought's??

Is there a driver that handles the interface between an external unit (my kindle) and the PC? Something that may have changed since the Win 10 update?