This is your chipset informatio
Motherboard Chipset Intel Lakeport-G i945G
Just a fYI
System Memory 512 MB (DDR2-533 DDR2 SDRAM)
You have minimum amount of memory to run XP with.
Go HERE and run the Crucial online scanner.
This will give you the exact memory configuration for your system. You do not have to buy the memory from there, but write down the information and if you need assistance in purchasing the upgrade memory GTG can assist with suggestions also.