Need assistance with an Avaya IP agent issue

I am getting the following error message when i try to run the avaya IP agent(release 6) post installation."cannot add TAPI service provider". I have installed Avaya IP agent on Windows XP and am running the software in telecommuter mode.Please help.....
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After installing IP Agent, you should reboot the PC.  If you do not reboot after installing IP Agent, it may be necessary to add the appropriate Avaya Service Provider manually using the Phone and Modem
Options from the Microsoft Windows Control Panel.

1. Reboot then log into the PC as administrator.

2. Choose Start > Control Panel and then select Phone and Modem Options.

3. On the Advanced tab, select Avaya IP Service Provider (if using IP Endpoint) or Avaya PassageWay Service Provider (for CallMaster VI on Windows XP only) should be listed. If one of those is not listed, select Add and follow the instructions on the screen to add the appropriate Avaya Service Provider.

4. Select OK to close the dialog box.

5. Restart Avaya IP Agent

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