Jinty,
The benchmark test you just ran will not tell you which components to replace. The application compares your system to others. Using this information you have to decide which components to change to increase performace. Regrettable at the age of your system this may not be cost effecient.
I custom build systems and prefer Intel CPU's. For your needs suggest Intergrated M/B, P4 2.4 Prescott, 512MB 333Mhzr DDR, 80 gig Serial H/D (ATA will work to reduce cost) 4x DVD RW/R.
This system has components that will cause some flames (be gentle). I build it as a base for future expansion (current M/B A-Open mx4sgvi-4dn2). Those that perfer AMD will come up with some good choices also.
Hope this helps
Bill in Zhills