what needs upgrading?

Heres my computer spec
Motherboard:
      CPU Type                                          DualCore Intel Pentium D 830, 3000 MHz (15 x 200)
      Motherboard Name                                  Foxconn 945P7AA Series  (3 PCI, 2 PCI-E x1, 1 PCI-E x16, 4 DDR2 DIMM, Audio, Gigabit LAN)
      Motherboard Chipset                               Intel Lakeport i945P
      System Memory                                     2048 MB  (DDR2-533 DDR2 SDRAM)
      DIMM1: OCZ Value OCZ2533512V                      512 MB DDR2-533 DDR2 SDRAM  (4-4-4-12 @ 266 MHz)
      DIMM2: Corsair Value Select VS512MB533D2          512 MB DDR2-533 DDR2 SDRAM  (4-4-4-12 @ 266 MHz)  (3-3-3-9 @ 200 MHz)
      DIMM3: OCZ Value OCZ2533512V                      512 MB DDR2-533 DDR2 SDRAM  (4-4-4-12 @ 266 MHz)
      DIMM4: Melco                                      512 MB DDR2-533 DDR2 SDRAM  (4-4-4-12 @ 266 MHz)  (3-3-3-9 @ 200 MHz)
Display:
      Video Adapter                                     NVIDIA GeForce 7800 GTX  (256 MB)
      3D Accelerator                                    nVIDIA GeForce 7800 GTX
Storage:
      IDE Controller                                    Intel(R) 82801G (ICH7 Family) Ultra ATA Storage Controllers - 27DF
      IDE Controller                                    Intel(R) 82801GB/GR/GH (ICH7 Family) Serial ATA Storage Controller - 27C0
      Storage Controller                                ITE IT8212 ATA RAID Controller
      Storage Controller                                SCSI/RAID Host Controller
      Floppy Drive                                      Floppy disk drive
      Disk Drive                                        SAMSUNG HD250HJ  (232 GB, IDE)
      Disk Drive                                        SAMSUNG HD250HJ  (232 GB, IDE)
      Optical Drive                                     PIONEER DVD-RW  DVR-112D        Optical Drive                                     SU5513D USC990Q SCSI CdRom Device
      SMART Hard Disks Status                           OK
Im having real problems running games such as cod4 Teamfortress 2…even with all the settings on low they just lag like a ~ censored ~.
So where do i need to upgrade Better memory,GFX card,Mobo,Cpu????
Cheers
Answer #1
Here you go mate,
CPU:
Intel Core 2 Duo
Mainboard:
Intel D33FB Motherboard
6-channel (5.1) audio subsystem using the Realtek ALC888* audio codec
Gigabit (10/100/1000 Mbits/sec) LAN subsystem using the Intel� 82566DC Gigabit Ethernet Controller
Memory: (RAM)
2 GB DDR2 700Mhz Memory (or more)
Video Card:
NVIDIA Geforce 8800GT 512MB
Power Supply:
Corsair VX550W (http://www.corsair.com/products/power_supplies.aspx)
Hard Drive:
Seagate 500 GB 7200 rpm SATAII Hard Drive
Mate it’s basically a WHOLE new System…
Answer #2
i have the same pc as u allmost and i get to run cod4 / tf2 on high an crysis on med settings no lag or fps drop
Answer #3
If you’re only looking for a cheap upgrade, then all you really need to change with that lot is up the processor to a core 2 duo, but it depends if your motherboard is compatible otherwise you need a new one of those too!
Answer #4
well if you got around 500 euro’s lying around you can buy an new motherboard an core 2 duo E6850 and an new 8800GT that will cranck your performance good up.