Re-bump with added question. Please help

This might be a noob question but can I boot up with my iPC dvd again and just add/remove components from my already installed OSX. And how would I go about doing this?

Thanks.

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Desktop:
AMD Athlon 64 3000+
MSI RS482M2 Motherboard
2GB DDR400 RAM
1x 80 GB IDE HDD
2x 120GB SATA HDDs
Creative Audigy Sound Card
GeForce 8500GT PCI-e Card

Laptop:
CPU
AMD Turion 64 X2 Mobile TL-50 (Socket S1 638), Codename: Taylor,
Cores: 2, Instructions: MMX, 3DNow, SSE, SSE2, SSE3, x86-64
Motherboard
Quanta 30B7
Chipset: Nvidia GeForce 6150
Southbridge: Nvidia nForce 410/430 MCP
Memory
4GB Dual Channel DDR2 RAM
Sound
Conexant HD Audio