Plug and Play not working

Hello all.. sorry for my english, i'm Italian.
I've a strange problem with my Windows XP. I was installing a Logitech
Webcam. I arrived at the step where the install wizard asked me to
plug the webcam into the usb port. I plugged it into a D-Link powered
Usb Hub. After searching a while for the driver, the system gave me an
error ("there was an error while installing the new hardware"). The
wizard suggested me to start a troubleshooting procedure. I started
it, and after a short period of time it said me something like "you
must connect the webcam directly to your pc". So I unplugged the
webcam from the 7 port hub and i plugged directly to an usb port of my
pc. Nothing happened, the wizard was not able to recognize the webcam.
I noticed that at this point the "Plug & Play" service stopped to
work.
If i go in the "Device Manager", i see only a white window, device
manager is empty.
If i go in "Services", Plug & Play service it's started, but the
"start - stop - restart" button are disabled (greyed). It's seem that
Plug & Play service it's no working anymore. Tried to start Windows in
safe mode, but Plug & Play service Start / Stop / Restart button are
greyed and disabled, even in safe mode.
I looked on the web for a possibile solution, but i didn't found
anything to make my Plug & Play service work again.
What i can do? Windows XP Sp2, pc AMD64 4000+, Motherboard MSI K8N.
The webcam i was trying to install is a Logitech Quickcam Pro 3000.
Thank you in advance for your help.

essediesse@gmail.com wrote:
> If i go in "Services", Plug & Play service it's started, but the
> "start - stop - restart" button are disabled (greyed). It's seem that
> Plug & Play service it's no working anymore.

in the Event Viewer i've nothing strange.. no errors, no warning,
nothing.. all seems to be fine, but plug & play don't work... what i can do?

SdS wrote:

> in the Event Viewer i've nothing strange.. no errors, no warning,
> nothing.. all seems to be fine, but plug & play don't work... what i can
> do?

tried to install Sp3.. same situation at reboot. Someone can help me?

SdS wrote:

> tried to install Sp3.. same situation at reboot. Someone can help me?

solved. I write the solution here, hoping that can be useful for someone
in the future.

The problems seems to be that there's a lot of poorly written software
(including device drivers) out there. Probably the problem is the key
type for the PATH statement being changed mysteriously. The reason:
probably the badly written installation program reads the original path
data from registry, adds it's own entry to the path string, and then
writes the updated path string back to registry as type "REG_SZ" instead
of "REG_EXPAND_SZ". That cause a permission problem on the registry

THE SOLUTION: Reset original permissions on your windows registry. To do
that:

1. Download and install SubInACL

http://www.microsoft.com/downloads/d...displaylang=en


2. Create a blank file named reset.cmd in C:\Program Files\Windows
Resource Kits\Tools folder.



3. Edit the reset.cmd file with the following content.


subinacl /subkeyreg HKEY_LOCAL_MACHINE /grant=administrators=f
subinacl /subkeyreg HKEY_CURRENT_USER /grant=administrators=f
subinacl /subkeyreg HKEY_CLASSES_ROOT /grant=administrators=f
subinacl /subdirectories %SystemDrive% /grant=administrators=f

subinacl /subkeyreg HKEY_LOCAL_MACHINE /grant=system=f
subinacl /subkeyreg HKEY_CURRENT_USER /grant=system=f
subinacl /subkeyreg HKEY_CLASSES_ROOT /grant=system=f
subinacl /subdirectories %SystemDrive% /grant=system=f



4. Enter into the CMD/Command prompt. CD Change Directory to C:\Program
Files\Windows Resource Kits\Tools



5. Run reset.cmd




That solved the problem for me.