Toshiba Bluetooth Stack - stalls at 10% on installation

This is a double issue.

I have a Toshiba Qosmio G30-163 running MCE XP SP3. I am re-installing
the drivers after a corrupted registry problem.

The laptop has Bluetooth hardware installed. I have downloaded the
latest Toshiba BT Stack s/w for XP and am trying to install it. I get
so far. The installation succeeds to the 99% mark. Then another window
opens "Installing Bluetooth Drivers." It has a blue progress bar. It
stalls at 5 bars = 10% complete. It hangs there - although there is
considerable activity on the main hard drive. Eventually I cancel the
installation. The main installation window responds with Installation
Completed. But the BT service doesn't work.

I have raised a ticket with Sitecom but the response was to remove all
drivers because the dongle is simply plug and play. This is wrong. The
device will not work without the drivers!!!

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I am also trying to install a Sitecom Bluetooth CN-516 dongle on my
Acer Aspire One 532h running Win 7 Starter. I am trying to install the
latest Toshiba BT Stack s/w for Win 7 (32-bit). Again this seems to
get to about 99% completion. Then another window opens "Installing
Bluetooth Drivers." It has a blue progress bar. It too stalls at 5
bars = 10% complete. It hangs there - although again there is
considerable activity on main hard drive. Then a popup window opens
"Insert Bluetooth Device" which I have actually already done. I click
on OK. Five minutes later the same popup window appears again
requesting that the BT device be plugged-in. I click on OK. This is
repeatable. Eventually I cancel the installation. The main
installation window responds with Installation Completed. But the
device doesn't work.

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What's going wrong please? Many thanks.