I don't have all your answers, but I have a couple:

In ,
AdeW typed:
On Jul 19, 9:25 pm, Paul wrote:
AdeW wrote:

....


So the same driver package should be working with that
camera.

Do you mean two drivers are trying to run simultanerously? Unless the
instructions say to do that, it could cause a lot of problems.



....


I eventually got round to finding a computer (called t3)
which had
never had the
....


can't find 5&28CODE0&0&2 anywhere but 28CODE must be a
reference to
code 28 error

Makes lots of sense.


I stopped at actually installing the driver for sn9c120
because of the
"not passed windows logo testing" message - although this
same message
appeared for
USBPCCamPlus_v5.18.1.005_120standard(1.3M).exe. I decided
to analyse the setupapi.log and snpstd3.inf files at this
point.

That message is pointless and generally useless as long as you trust the
software you have. MS at one time dreamed of being the king of all software
installations and thought the world would register their software with them.
Well, no one did of course, or hardly anyone, which makes sense. If it IS MS
trusted, then it should be fine to use. If it's not, it's up to the user to
know where they got the software from and to know it's safe to use (free of
bad code, malicious code, etc). So it's quite safe to use as long as you are
sure the place you got it from is a white hat. In other words, you used
common senseg.
....

HTH,

Twayne`