Windows Upgrades for first XBMC Windows setup

Hi

I have recently put together an XMBC Media center machine, after getting an Antec Media center case in exchange for some work I have done for one of my clients. From my spare's I had laying around I put together the following setup, which has been a vast improvement over my PS3 and old modded xbox:

Windows 7 x64 Professional
Antec Micro Fusion Media Center case with 350w PSU + WMC Remote
Asus AT3N7A-I Ion Intel Atom N330 DDR2 ITX Motherboard
2gb DDR2 533mhz RAM
160gb 3.5 WD HDD
TS DVD-RW drive

I would like to try and decrease the noise of the system and also improve performance on loading times. What would be the best components to replace/upgrade to help with this?

well, you cant expect much on an ATOM platform....
its pretty anemic....

i mean, either you get some new hardware for your case,
and ditch the old one,

or

stay as is, and get an SSD to help speed up your boot times.