Many thanks QB.
I have now found the filter driver in the 13.1 sb set of files. This is a different version of the driver and is in Catalyst software that is labelled as referring to later chipsets that, for example the 4500 series that I have on a machine here.
When I search in the legacy areas, I cannot find the sb set of files, just the ccc set. These do not appear to contain the usb filter. I very prepared to admit that I have not done a thorough search, as I find these AMD/ATI sites very confusing.
The text file with the 13.1 filter driver says
AMD USB Filter driver is an upper class filter driver that needs to be installed when using platforms that have any of the following AMD hardware:
Ontario, Llano or Trinity APU paired with Hudson 1, Hudson 2 or Hudson 3 FCH
RS780 / RS880 paired with SB700 or SB8x0 GFX / SB chipsets
How do I get a non-technical person to check whether their machine is affected by this? Does this filter driver work across the range of ATI chipsets, or are different versions needed?
I would advocate a manual install rather than risk installing the Catalyst suite. I have often had problems on various machines with the full suite.
Sorry for all the questions.