Unknown device - ipod nano fine - problem with windows xp and usb root hub

Greetings all. I've seen this question come up over and over again and have been working on it following previous posts and posts on microsoft and hp sites for a couple of days now.
First off - the ipod nano is fine. Works on my son's computer well.
When I plug it into my 6 months new HP Pavilion laptop it says: 'found new hardware' and goes through the process of installing it, says it's been installed, but then shows 'unknown device'. In Device Manager it tells me there are no drivers installed, but when I try to follow the other instructions on this forum to update the drive to USB mass storage device (usbstor.inf), it tells me the best driver is installed and won't do it.
Many seem to have this problem with devices other than the iPod on Windows service pack 2 so I went to the Microsoft forums and they seem just as puzzled. I've updated all my Windows & HP software to the latest possible versions. The problem is definitely in the USB. Once, when I uninstalled the USB device and then rebooted the computer with my iPod still plugged into the port, it found my iPod, correctly identified it, and for a blissful moment I thought everything was fine! Then it reinstalled the USB drivers and made a comment to the effect that I should move the iPod to a USB 2.0 port for more effective operation and the iPod disappeared again.
I have 3 USB ports on my laptop, all are USB 2.0 and all 3 have the same problem.
I've tried all the stuff people have already said on here...does anyone have any NEW ideas? I'm hesitant to take it in for service because it seems to be a software problem that should be fixable.
Thanks in advance for your help and sorry about the long post.

This isn't a solution, but it's something I just tried and it may provide someone additional clues about's going on. I too think this is some sort of USB problem.
I have 6 USB ports. Two of them are USB 2.0. Since I applied the 03-23 update my computer hasn't recognized my nano at all. I would connect my nano and I couldn't get it to show up in My Computer, in iTunes, or on the far right side of the Start taskbar.
I just tried plugging my nano into the first USB port of my USB 2.0 pair and left the second 2.0 port empty. I then rebooted with the nano attached. Viola - I get a "Found New Hardware Apple iPod USB Device" message. My nano is now flashing "Do Not Disconnect." A small removeable storage icon with green arrow now shows on the far right side of the Start taskbar. If I click on it (like you're going to eject it) the note displayed says "Safely remove USB Mass Storage Device - Drive (F:)".
If I go into My Computer, "Removeable Disk (F:)" now shows there. However, if I try to follow Trevor's instructions in another post to "go into My Computer with iPod connected, right click it, wait till the right click menu comes up (could take a few minutes); click Format, . . ." I'm stuck. I do the right click, watch the hour glass and wait for the Format menu to come up but it never does. Eventually the hour glass just goes away. No message, no Format menu. The waiting hour glass just goes away.
My computer isn't as new as yours, but like you I am completely current on maintenance.
I'm going to keep trying . . . If anyone has any ideas, please let me know.
Dell Dimension 8100 Pentium 4 Windows XP Service Pack 2 Phoenix ROM Bios PLUS Version 1.10 A09

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2) The ipod touch does not support disk mode so you can't see it under "my computer" and this is not a problem.
3)There is nothing wrong with the ipod, it works perfectly.
4) This is not a usb cable physical problem.
5) The five R's are irrelevant with this situation.
Uninstalling and reinstalling itunes doesn't solve the problem, neither does hard resetting the ipod.
6) Older PC configurations seem to be more affected by this but it doesn't have to do with unsupported specific chipsets.
Here's what needs investigating:
1) There may be a problem with the apple mobile service running on win XP.
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This is a serious issue that needs immediate attention. I've stumbled across forum discussions dating to 2005 with this problem (with older ipods of course).

I think this needs to be put down to the eternal PC/Mac argument. Apple dont want to fix this as they want everyone to buy a Mac. Its a business, understandable, but in turning away PC buyers they alienate a huge percentage of the market.
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Because my Touch has now been trying to connect to 6 separate installs of itunes, multiple USB ports, multiple USB cables, a complete overhaul of the registry settings (everything else still works), and the loss of all my previous settings and backups from the last Touch... but still, the PC says its an ipod but cant install it, iTunes sits there, dumb.
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