Truly unknown device can't be found anywhere--what to do

Device Manager has an unknown device listed. I used Unknown DeviceIdentifier 8.0 and other search methods and this is what I got:

Windows Device Manager
Device type: Universal Serial Bus Controller
Manufacturer: Standard USB Controller
Under Details I found:
Location Port: Port_#0002.Hub.#0004
Driver Provider: Microsoft
Driver Date: 6/21/2006
Driver version:6.1.7601.17586
Physical Device object name: \Device\USBPDO-6
Device Instance path: USB\VID_0000&PID_0000\6&29E6B3C2&0&2
Parent: USB\VID_8087&PID_0020\5&203162ce&0&1
Container ID: {228ca907-7860-11e2-8dc0-806e6f6e6963}
Driver node strong name: usb.inf:Generic.Section.NTamd64:BADDEVICE.Dev:6.1.7601.17586:usb\unknown

Unknown DeviceIdentifier 8.0 lists it as:
Unknown device
Vendor Microsoft
PropID: usb\unknown

From another website I did a Google search for USB\VID_0000&PID_0000\6&29E6B3C2&0&2 and produced no results. I then went to: the PCI database website and still no results.
Considering that everything points to Microsoft I find this odd and don't know what i should do about it. Any suggestions?
Thanks

Thanks a lot Brink--truly appreciate it. My PC is not a name brand--it was out together so Belarc Advisor has this info:

Operating System
Windows 7 Home Premium (x64) Service Pack 1 (build 7601)
Install Language: English (United States)
System Locale: English (United States)
Installed: 10/21/2012 2:14:46 PM

Processor a
2.80 gigahertz Intel Core i5 760
64 kilobyte primary memory cache
256 kilobyte secondary memory cache
8192 kilobyte tertiary memory cache
64-bit ready
Multi-core (4 total) Not hyper-threaded

Main Circuit Board b
Board: ASUSTeK Computer INC. P7P55D-E LX Rev 1.xx
Serial Number: MT7006K30202986
Bus Clock: 133 megahertz
BIOS: American Megatrends Inc. 1003 05/24/2010

Drives
2650.43 Gigabytes Usable Hard Drive Capacity
1657.40 Gigabytes Hard Drive Free Space
ATAPI iHAS324 B ATA Device [Optical drive]
LITE-ON LTR-52246S ATA Device [Optical drive]
PHNTMBLT PHANTOM CD SCSI CdRom Device [Optical drive]
ST31000528AS [Hard drive] (1000.20 GB) -- drive 2, rev CC44, SMART Status: Healthy
WDC WD1500HLFS-01G6U3 [Hard drive] (150.04 GB) -- drive 1, rev 04.04V05, SMART Status: Healthy
WDC WD15EARS-22Z5B1 [Hard drive] (1500.30 GB) -- drive 0, rev 80.00A80, SMART Status: Healthy

Controllers
ATA Channel 0 [Controller] (5x)
ATA Channel 1 [Controller] (5x)
Standard AHCI 1.0 Serial ATA Controller
Standard Dual Channel PCI IDE Controller (4x)

Bus Adapters
Phantom CD SCSI Controller
NEC Electronics USB 3.0 Host Controller
NEC Electronics USB 3.0 Root Hub
Standard Enhanced PCI to USB Host Controller (2x)

Other Devices
HID-compliant consumer control device (2x)
HID-compliant device (4x)
USB Input Device (5x)
HP Webcam 3100
HID Keyboard Device
HID-compliant mouse (2x)
eHome Infrared Receiver (USBCIR)
Generic USB Hub (2x)
USB Composite Device (3x)
USB Root Hub (2x)
Generic volume shadow copy
Xbox 360 Wireless Receiver for Windows

Hope this helps (I also have the above from SPECCY if needed)

Hi once again thanks

Hi I know it doesn't say "what model number (my) Asus PC'' is. Sorry for not making that clear. It is not an Asus PC it is not any PC. I went to a store that sells and assembles computers based on parts wanted--this motherboard with that video card and those memory sticks etc. etc. hence no name As to the NEK i know that installing the wrong drivers are risky, so would you mind if I asked how sure you are of the ones you suggested? Also why can't Windows (especially seeing the microsoft connection of the drivers,) seem to read what it should?

Thanks again

Thanks again for you continuing help; In double checking what I have, there is a shortcut on my start menu for the usb controller that is currently there, it so happens to be, interesting enough, the exact same thing u r suggesting I download, the NEC. Question now remains, since that is already installed then -a- is windows thinking/referring to another USB -b- if not then why am I getting this 'unknown device" reading?

thanks again. I went to ur link and all i saw was my model number being displayed and nothing else.
Eventually I ended up here: SUPPORT where I put my model number etc. It took me here: ASUS - - ASUS P7P55D-E LX ON this page there were all sorts of stats from various parts such as:

CPU, Chipset and Graphics features, Memory Features, Future Transfer Technology etc.
Nothing and I mean nothing was linkable or downloadable here. I tried again and again even using dfferent browsers. It appears as if something is wrong with the site since the original start point of this page is supposed to be for downloads. Hmmm!!??