I had the same errors 6 and 50.
I removed the modem software and any drivers to do with it. turned the Pc off and removed the card/hardware.
Inserted the windows XP CD and did a repair on existing instance.
Downloaded the latest dirvers for the modem and installed them.
Switched PC off and installed hardware.
Booted and modem found ok.
No more Error 6 and 50.
The repair did not affect existing apps and settings, but fixed my prob.
Please could you add this suggestion to that thread. (albeit a shotgun approach, other blogs mention days worth of fiddling to resolve this issue - and still didnt resolve)
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