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Windows 7: Severe "Unknown Devices"-problem!

06 May 2010   #1

Windows 7 Ultimate x64
Severe "Unknown Devices"-problem!

Hi everyone,

I recently got a disturbing problem on my studio workstation - I was stupid enough to install iTunes, realized the havoc it made to services and general resources so I uninstalled it. Unfortunately my 4-port USB-Hub ceased to serve me afterwards, had to reset and move it to the first USB-port on my mainboard to get it working. All seemed fine, however after abt. 30 min uptime it gets saggy, a DPC latency check reveals nasty 1000+ms glitches every 3-4 sec. This ofcourse makes the machine totally unusable for audio/video production.

I check the Devices panel and find a new "other devices" subsection, filled with OVER 200(!!) "Unknown Devices". I've NEVER ever seen something remotely similar (see attachments)... these are ofcourse the culprits to my Windows 7 sag so they need to go.

Why do these appear without hardware or services/software demanding hardware, and how can remove these?? Preferrably all at once (not possible in device manager), but stopping them from reappearing after I uninstall them one by one would do by far.

What I already have checked so far:
- that nothing starts on boot that shouldn't (user, all users and registry)
- that no unfamiliar services are running
- that there are definately NOT 250 hardware peripherals connected.
- that all drivers are installed correctly - the unknowns are all ghosts in addition to these..

If anyone has some tricks, tips or things to try I would be insanely grateful, I need my studio working longer than 30-40min, it's hopeless...

Attached Thumbnails
Severe "Unknown Devices"-problem!-devices_errors.jpg  
Attached Images
My System SpecsSystem Spec

06 May 2010   #2

W7 Ult. x64 | OS X

From what I can tell, this is caused by a malfunctioning device. It happens to me in a much smaller scale at times if I use an older flash drive as a readyboost disc.

You should really remove peripherals one at a time to figure out what exactly is causing the problem.
My System SpecsSystem Spec
06 May 2010   #3

Windows 7 Ultimate x64

I forgot to add that in my checked list, but I already did that. No change.

Readyboost is disabled, and I've tried disconnecting every single device except my old ps/2 Bios-keyboard - still no change.
My System SpecsSystem Spec


 Severe "Unknown Devices"-problem!

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