Windows Errors

Windows Cannot Start This Hardware Device Code 19 [Solved]

The code 19 windows 7 error can prevent certain hardware components to function normally.
The commen problem code 19 windows 7 error is the cd-rom that stops functioning.

Most of the time this is a registry problem and is easily fixed once you know where to look.
Basically the error code 19 consists of corrupted registry values that need to be deleted to
let the hardware function properly.

Delete the UpperFilters and LowerFilters Registry Values

1. Go to Start >> Run
2. Type in: regedit and press ENTER
   Now the Registry Editor Opens
3. Navigate to the HKEY_LOCAL_MACHINE folder, which is a subfolder of My Computer. Expand This folder. 
4. Expand the following folders to reach the folder: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class.
5. BackUp your registry files.This is not mandatory to fix the problem, however it is simply good practise to backup the registry when you are making changes to it. The registry is one of the most important parts of your system.
   Go to File>>Export  choose a name and save anywhere you like
6. Click on the |> or (+) icon next to the Class key to expand it. Now you see a list of subkeys in the folder class, Navigate to the folder that corresponds to the device that gives you the error. You can select the correct folder from the list below:
   
   
   

   Class	GUID	Device Description
   CDROM	4D36E965-E325-11CE-BFC1-08002BE10318	CD/DVD/Blu-ray drives
   DiskDrive	4D36E967-E325-11CE-BFC1-08002BE10318	Hard drives
   Display	4D36E968-E325-11CE-BFC1-08002BE10318	Video adapters
   FDC	4D36E969-E325-11CE-BFC1-08002BE10318	Floppy controllers
   FloppyDisk	4D36E980-E325-11CE-BFC1-08002BE10318	Floppy drives
   HDC	4D36E96A-E325-11CE-BFC1-08002BE10318	Hard drive controllers
   HIDClass	745A17A0-74D3-11D0-B6FE-00A0C90F57DA	Some USB devices
   1394	6BDD1FC1-810F-11D0-BEC7-08002BE2092F	IEEE 1394 host controller
   Image	6BDD1FC6-810F-11D0-BEC7-08002BE2092F	Cameras and scanners
   Keyboard	4D36E96B-E325-11CE-BFC1-08002BE10318	Keyboards
   Modem	4D36E96D-E325-11CE-BFC1-08002BE10318	Modems
   Mouse	4D36E96F-E325-11CE-BFC1-08002BE10318	Mice and pointing devices
   Media	4D36E96C-E325-11CE-BFC1-08002BE10318	Audio and video devices
   Net	4D36E972-E325-11CE-BFC1-08002BE10318	Network adapters
   Ports	4D36E978-E325-11CE-BFC1-08002BE10318	Serial and parallel ports
   SCSIAdapter	4D36E97B-E325-11CE-BFC1-08002BE10318	SCSI and RAID controllers
   System	4D36E97D-E325-11CE-BFC1-08002BE10318	System buses, bridges, etc.
   USB	36FC9E60-C465-11CF-8056-444553540000	USB host controllers and hubs

7. In the correct folder you should see one or two of the following keys: UpperFilters and/or LowerFilters.In some cases you also see: UpperFilters.bak or LowerFilters.bak you do not need to delete these.
   
8. Delete the Upperfilter and/or LowerFilter keyClick Yes when prompted: "Deleting certain registry values could cause system instability. Are you sure you want to permanently delete this value?".
9. Close the Registry Editor and Restart windows

This should solve your "windows cannot start this hardware device code 19" problem.