Dial-Up Networking Error - Registering your computer on the network, Error 720

I am helping a customer install a Sprint PCS Vision Aircard - the card works on other systems without any problem.  When we install on his laptop, and try to dial out, we get a Dial Up Networking error # 720 while trying to register the computer on the network.  I've done extensive research and found that this has something to do with TCP/IP corruption.  Here is everything I have tried so far without success:

netsh int ip reset resetlog.txt
Winsockxpfix.exe
Followed MS Tech Article 810979 (even though this is for Windows 2000)
Installed Windows XP on top of itself using the setup repair option

Is there anything else you can suggest short of formatting the drive and reloading?  I really want to avoid this at all costs.

Thanks

Jason
ADOPTATECHAsked:
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ADOPTATECHAuthor Commented:
This is Windows XP Tablet Edition
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LeeTutorretiredCommented:
This page may be of help:

http://www.modemsite.com/56k/duns720.asp

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ADOPTATECHAuthor Commented:
That site gave the same recommendations that I already listed as tried.  The customer needed their system back today, so I ended up loading Windows XP into a new directory on the drive - the card worked fine from the fresh copy of XP.  I'd love to know what was actually causing this, but I just ran out of time on this one.  Thanks.
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Windows XP

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