TSP cannot be installed on some PC

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Hello,
my TSP can be installed on my PC easily, either with "phone and modem
options" in the config panel, or with lineAddProvider in TB2. It also works
on another PC, but on another one, we simply can't see it in the list of
available TSPs. When we try to add a TSP with lineAddProvider it fails :

10:53.39.444 : Calling lineAddProvider
lpszProviderFilename=x6ed94
hwndOwner=xa0110
lpdwPermanentProviderID=x6ee0c
10:53.40.490 : lineAddProvider returned LINEERR_OPERATIONFAILED,

While the three are running Win XP, the two which are working are on SP2,
while the failing is on SP3. I've also tried to install it on a virtual
machine with VMWare running a Win XP SP2, and it does the same thing : tsp
invisible and lineAddProvider failing.

Any idea ? Thanks in advance.

--
Adrien HAVAS
Student at ECE, School of Engineering Paris - Information Systems &
Networking


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