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External hard drive found as unknown device
I have a LaCie external hard drive which works fine on other pc's running Windows 7 Ultimate, but on this one it is an "unknown device". I have tried it in different ports but with the same result. I've checked with Windows Compatability and the exact model is listed there as being compatible. I've been to the manufacturer's website but there are no drivers available.
I have the same problem with any USB device I plug into any port. I have tried a complete Windows re-install from a different CD but it made no difference.
The only USB devices that work are the keyboard and mouse.
I have given the LaCie HD as an example because I am hoping that if I can get a specific device to work, I may be able to solve the problem with others.
I've done the upper and lower filter removal thing in Regedit, and have uninstalled and reinstalled the USB drivers numerous times but nothing works. I've also updated the BIOS.
Any ideas please?