Fresh install, reason posted elsewhere (sorry).
And that is a GREAT SSD! OCZ Vertex 2 120GB is one of the best, and not as costly as others rated less. Also look into a OCZ Agaility 2, might be a few $$ less.
And, once you have a SSD, you'll never go back. Keep your HDD for data/media (Documents, Downloads, Music, Pictures, Videos, etc.).
I'd bump that OS to a 64-bit, to use all of your RAM!