In my experiences the infuse is just a pain in the arse when trying to connect to the computer for the first time. Seriously if you don't have the perfect cord, the proper USB port on your computer, and the sun isn't at the proper angle in relation tovthe orbit of Saturn it just wont freaking work. On that note, in addition to manually installing the drivers you could try a different USB port, a different cord, a different computer, or maybe a wizard.
The guide to rooting a Rogers infuse is in the sticky section of this q&a thread and the iset (infuse super everything thread) is in the sticky section of the infuse android development thread.
First time rooting I would suggest playing around with flashing gingerbread roms. They are safer for lack of a better term. I don't mean like completely kill your phone safer (the infuse is incredibly hard to permanently brick) but easier to fix mistakes. If you screw up going to jellybean you have no choice but to Odin or heimdall back to stock. With gingerbread you aren't changing file systems or partition sizes.
I can't stress this next part enough- READ. EVERYTHING. DON'T SKIM. READ. THEN READ AGAIN. The more you know the easier it is. The fact that you are on an infuse means that you have the luxury of a very friendly community at your disposal. Most of the people here will help. Especially if they get the impression you are trying to help yourself.
Good luck and let us know I'd you have any questions. The iset thread is a wonderful thing full of tons of info. It can be overwhelming though. I check in multiple times a day so if you need help just holler.
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