Usb Device Not Recognized Using Samsung Galaxy S2

Ok so my samsung galaxy s2 was working fine, i had if for about 4 months and i had connectivity with my laptop running windows vista home premium. However last week i updated the software and was trying to update the firmware via kies when i got the error - usb device not recognized. One of the usb devices attached to this computer has malfunctioned, and windows does not recognize it.

On the phone the mtp initialization appears then shortly says connected afterwards. However windows cant see the phone. I believe i have tried everything to resolve this, i have;

A) done a factory reset on the phone.
B) re-installed the latest version of kies and drivers ensuring everything , including drivers and associated files were wiped from my computer
C)tried different usb cables including the oem cable and various aftermarket ones.
D)tried all the usb ports on my laptop.
E)tried other laptops and desktops.
F) tried de-bugging mode.

I'm sure there is a g) and an h) but can't think at the min. So does anyone have and ideas? I'm starting to think the phone is faulty and send it back. Many thanks in advance for any suggestions.

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