Vista - Performance rating low

Hi. I just installed vista on my PC and I got a performance rating of 2,
which is sort of low. I was wondering what performance rating others have
obtained because it seemed pretty low to me, despite the fact that it killed
the system requirements

According to it

P4 CPU 2.93 GHz - 3.5
Memory 1 gig- 3.2
hard disk 80 gig - 3.8
nvidia geforce fx5500 - 2.8
graphics mem 256 MB =2.5

To improve it I'm planning on getting some more hard drive space and some
more memory. Will that work?

Thanks