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Windows 7: UMBus Root Bus Enumerator - Unknown Device

02 Nov 2015   #11

Windows 7 Home Premium 32 bit

Viewing the posts of August 17-21, I believe I may have the same/similar problem. This involves a Dell Inspiron, Win 7 Home/32 bit setup. I recently installed and ran a trial IOBit registry cleaner/updater/etc. Now the HP OfficeJet 6700 will not function – completely. Running the Devices and Printers troubleshooting function (the “computer” icon – not the printer was marked) I got the response: Programmable Root Enumerator – Failed (that listed twice) and OfficeJet 6700 – no driver found.
As I suspect a registry change/error has occurred, I did try to follow your lookups and instructions within the posts:
1. Check If These 3 Files Exist(C:\Windows\inf\umbus.inf; C:\Windows\inf\umbus.pnf; C:\Windows\System32\drivers\umbus.sys)


2. Looking at System Devices, under Other Devices, OfficeJet 6700 is listed three times and all marked with the yellow warning triangle. Under Programming Support, Programmable Root Enumerator is listed three times. The top entry is not marked and indicates it is working properly. The next two entries are marked with a yellow warning triangle and This device is not working properly because Windows cannot load the drivers required for this device. (Code 31). All other files within System Devices are working properly.

3. C:\Windows\inf. You should find a file named either or

Two files titled setupavi.setup log are listed at that location. One is dated 10/20/2015 and highlighted in blue. The other has today’s date (when I tried to print/fix). I have zipped these tow text files and they are included.

4. I did follow your instruction and looked at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\DevicePath

What appeared was: DevicePath (type)REG_EXPAND_SZ (data)%SystemRoot%\inf

At that point I’m lost. I can see in the logs the “failure” but have no idea why or how to correct things.

I do appreciate any help--

My System SpecsSystem Spec
04 Nov 2015   #12

Desk 1: Win 7 Pro x32; Desk 2: Windows 10 x64

Hi montg011

fyi... It's best to start a new thread for your problem as it draws attention to it as a new problem. Others may also be able to help. Your new thread can reference/link back to your original post above.

That said, I'm travelling for another week or so but will try and have a look as i can. Meantime, see if you can do a System Restore to a date prior to the problem.

p.s. Registry cleaners are not worth trouble they can cause. (Or use them only if you know how to restore a system the cleaner may have broke!)
My System SpecsSystem Spec

 UMBus Root Bus Enumerator - Unknown Device

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