Couple things:

-Is the drive formatted? (Actually, maybe just post a screenshot of your Disk Management screen.)

-Try opening a command line, running "diskpart", then "list disk", "select disk N" (where N is the disk in question), "list volume", and posting the output here.

disk management

The output for volume was a list of options.

Gonna guess the 1863 unallocated GB is the hard drive.

First off, to confirm: this is a new hard drive (or at least one with nothing important)? If so, do as follows. Otherwise don't do as follows 'cause it'll wipe what's on there.

Right-click it (the area down below with "1863 GB") and look for an option to make a new simple partition or new volume. Follow through with that, and afterwards right-click it again and you should be able to assign a drive letter.

If there is data on it you want to save, you'll need some recovery software to repair the partition.

A new simple volume work? And yes, this is a brand new drive.

Yup, a new simple volume should work fine, assuming you don't want to do anything fancy with the hard disk (divide it into two chunks of space seen as separate drives, etc.)

Mostly, I was planning on using it to store stuff, to be honest.

Aaand, there we go! H: drive!

Many thanks, yo. Couldn't have done it without you.

Glad to hear it's all worked out!

There maaaaaay be a new issue though.

Even after updating the drivers on my nvidia geforce 660 ti graphics card, it says my card doesn't support Aero Effects??

Have you tried reinstalling it? If that doesn't work, just install a previous version until another update comes out. May I ask which version of the Nvidia driver you have?

-Rez

EDIT: The answer to this question posted in the Microsoft forums might be helpful as well. While the person who asked the question has a different graphics card than you, the answer will help you try and troubleshoot the Aero issue regardless of your graphics card.