how can i use sprint htc touch pro 2 as a modem for my laptop??

[imbrucelee]

HELP!! Im trying to connect/ tether my touch pro 2 to my lap top and I keep getting an error code message:
error code: 67
error code 67 registration failure. Your pcs vision username and/or password may be incorrect. Please try again
this pops up whenever I try to use the internet sharing function. I called sprint they said its impossible to do, they don’t have that phone as a modem feature. Ive read I need to change the registry, but don’t know how. The phone is the latest version with the wanna be android menu. Im completely lost, and not familiar with any of this stuff. Thank you!!!