Henry’s desire to win is obvious.

Is it a:

gerund
infinitive
prepositional
participial

Yes. It's an infinitive.

Infinite...

sorry it is...to win

Thank You Ms. Sue...I appreciate your time.

You're welcome, Deb.

Which word are you supposed to identify?

The phrase to win is made up of the word to plus a verb. What do you think it is?