Windows XP: Unknown Data Usage

I am currently running Windows XP on a 180gb hard drive = 167gb in real data space.
The problem is i just did a fresh install with a new computer, wiped the hard drive clean, and i only added 114gb of data onto the drive.
However, the problem is it says i only have 16.6 gb of free space, that leaves roughly 37gb if unaccounted space, and i don't believe Windows XP takes up 37gb.
Thank you for your help

[Omega]

Just to make sure...Windows does report that the volume capacity is 167 GB, right? It's possible that you didn't make the partition the entire drive, or something...

[vee_ess]

Also make sure that your BIOS supports the new larger hard drives. Many of the motherboards that aren't the latest get funky with out-dated BIOS's and hard drives over 130 gigs.

Check and see what size your page file is, and also check your system restore size. System restore can take up a huge chunck of dedicated space if left on it's own.