I use Vista also makes no difference.
1. Go to
Commonly requested & popular software/applications and download a
Registry Editor I use MeMmaid.
2. change the following registry -
Go to [HKEY_LOCAL_MACHINE\Comm\InternetSharing]
Then Delete "Extension"="rilphone.dll"
After that edit the dial "Phone as Modem" to "Sprint PCS"
3. Softrest.
Same reg edit works on the touch.
That should be all. Then just got to Programs and open your Internet sharing App connect the usb and click connect.