A six years computer's upgrade options are severly limited:
1 - You can probably no longer upgrade the CPU, newer models are just not socket compatible. Even evolutions of a CPU model are not always socket compatible. If you are lucky, you may find a retailer who still have a compatible CPU, but don't count on it. You may already have the fastest CPU compatible with your motherboard and it's BIOS.
2 - If your video card is an AGP card, you'll have to search some to find one.
You can upgrade the RAM and add another hard drive.
Adding RAM can help gain some performance increase, mainly by reducing the need to access the, extremely slow, page file.
Adding another drive only gives you additional storage. Be carefull, you may need an ATA drive (whide flat and gray ribon cable with 2 connectors for the drives), not a SATA (thin cable, one per drive).
Frankly, you should instead get a new computer. It will be a multi-cores 64 bits computer loaded with a 64 bits OS. It's performance will ridiculise that of your actual computer.
As others have proposed, you can get the separate parts and assemble your new computer. In this case, you can reuse/recycle at least some components from your actual computer.
You'll need a new motherboard, a modern CPU from Intel OR AMD, new DDR3 RAM, one SSD "hard drive" where you'll install the OS and your applications and at least a conventional SATA hard drive for your data.
Also, get a 64 bits OS, otherwise you'll be unable to fully use the new hardware.
You'll be able to keep your actual hard drive(s), case, keyboard, mopuse, monitor, sound card, speakers, and possibly the power supply. You may need some SATA to ATA adaptors (attach to the back of the drive), or a PCI to ATA card if you have ATA drive(s). Modern motherboards normaly no longer support ATA.
If you have an AGP card, you need to get a PCIe video card.
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