Problem in installing external devices

I have Vista Home Premium pre installed in my HP Pavillion DV6000 series laptop.
It was working fine for some time .  but now its started giving problems ... whenever I tried to use Kingstom Pen Drive, or any other external device it start finding the drivers and then lost.

when i plug in the device it shows in the diskmanagement but not in the my computer.
I tried to format the drive or assign drive letter .. it gives error "the operation failed to complete because the Disk Management console view is not up-t-date.  .....

Could anyone help me out

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first delete all the usb entries in device manager, reboot and test. If still problems , try these :
unplug pc from power for 30 minutes
then test
What happens when you start the removable service. Delete the upper filter and lower filter from here
usb device.
Delete upper and lower filter and restart the computer.
Vista :
Remove volume.inf and volume.PNF from C:\Windows\Inf and replace it  with files in C:\Windows\System32\DriverRepository.  Also replace volsnap.sys in C:\Windows\System32\Drivers from same directory and reboot.  
you may have a  BSD on reboot.  Reboot, everything normal.
 Insert USB Flash Drive, unknown device shows up in Device Manager.
Tell system to search C:\Windows\System32 with SubFolders checked and it is now able to find and install Generic Volume Driver.  

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priyankkguptaAuthor Commented:
"You may have a BSD on reboot"
What do you mean by BSD
priyankkguptaAuthor Commented:
thanks for your help
Blue screen of Death, referred to as BSOD
...and what worked in your case ?
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