The following may help if manual updating is not immediately obvious: Note: I realise that it can sometimes be difficult to navigate through device manager to the manual update point. This time success! It loaded the drivers and indicated my I9000 (Galaxy S) device was connected.

I navigated to the folder I had unzipped the drivers into, ticked include subfolders and hit OK.

Search automatically had already failed so I hit browse my computer for driver software - the manual way*

Right clicking on the faulty MTP device in device manager and choosing 'update driver software' gave me the option of searching automatically and browsing my computer manually.

There will probably be a little yellow error triangle on your device that has the problem.

Navigate to 'portable devices' or 'MTP' in device manager, whichever one shows up with the error.

Navigate to device manager (control panel ->Device Manager or Administrative tools -> computer management -> device manager).

The drivers should then work as the 圆4 does. This can be unpacked/'unzipped with 7zip freeware in exactly the same way as a zip file.

(Update courtesy of Tim) The x86 link gets you an exe file.

This got me a zip file which I scanned with an AV (don't forget to do this!) and then unzipped to a folder I knew the location of (make sure its easy to find).

After a bit of searching, (Google again) I finally found the right driver here:

Samsung mobile usb mass storage driver