USB serial driver not getting installed  

Device Recognition happens first. After recognition, Windows searches for a suitable device driver. Windows doesn't need the device driver to recognize the device, it needs it before it can use the device functionality So i don't think the ser USB driver is the issue... Your problem on the machine is the device can't be recognized.... but we'll still attempt to clean ser driver things up as sometimes ain't nothing 100% sure about Windows computers!

But first,
1. Have you reinstalled the chipset drivers for your computer??
2. Can you tell me which BIOS version you're running on your computer?
3. For the computer that worked, what version of Windows was running? was it 32 or 64 bit?

It worked on windows 7 64 bit.
NO i had not re installed chipset driver still.
Maybe i will try to do that.
Bios version is HP68ICE version F.31 ,9/24/2012.

I am very much sure now that if i recover by driver it will work.
now i will try chip set as i went on HP site and got all 3 drivers under chipset.
do i need to install all three.
here is the link from which i downloaded.


http://h20566.www2.hp.com/portal/sit...ty%20-%20Tools

Whoa... You have a very out-of-date BIOS for your machine. Update your BIOS first. Carefully follow any instructions from HP. Make sure you laptop is plugged in so no loss of power during your BIOS update. Try again after BIOS update.

If still a problem, then re-install the chipset drivers. Not sure if order matters, but i'd do them
> Intel Chipset Utility
> USB 3.0
> Management Engine

Thanks a lot.
My problem is i don't think i can update my BIOS till company approves it.
but i will definitely try to re-install chip.