How a computer upgrade? Please answer the master

Users questions: Recently the computer always go wrong, intermittent network, the computer may be upgraded, experts figure it out, be grateful. Here is my computer configuration, please help out a solution. Motherboard: Gigabyte 865PECPU: Intel Celeron 2.4GHz processor Memory: 1.25G Video Card: HASEE NVidiaGeForceFX5200 128m memory card BIOS information: Version4.34.20.69.00 integrated network card: RealtekRTL8169 * 8110FamilyGigabitEthern etNIC Disk Drive: ST380011A Hard disk capacity: 80G I intend to increase the capacity of the hard disk, swap a CPU, hard disk how much right? Ready to play the game, the higher the better as CPU performance, hard disk Which model is best? The most appropriate piece of the CPU performance? Graphics or Xu is also the upgrade, the memory is too small to be cost-effective solution, thank you master over to help.
Experts answer: hard drives are cheap now, you can add a secondary 80G's. Pentium 2.0G processor over another.
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