Vista Partition Install Question

Ok, I just re-installed Vista on my desktop, and it's making do the advanced install where it has me select a partition. Only problem is, I don't know which one to choose, or even if it matters, so I was hoping someone could point me in the right direction. My partitions are as follows...

Partition 1: Total Size 295.6 GB Free Space 0.0 Primary
Partition 2: Total Size 2.5 GB Free SPace 369 MB Primary
Unallocated Space: Total Size 9.0 MB Free Space 9.0 MB

*Note* At the bottom of the install screen it has a caution symbol saying windows cannot be install to the Hard Disc you must select a Partition to reformat under NTFS.