I ran the CPU-Z. F5 screenshot wont work for some reason, but heres the specs:
Manufacturer: Dell Inc.
Chipset: Intel i915P/i915G
Southbridge: Intel 82801FB (ICH6)
Memory: Slots 1 & 2
(Same for slots 1 & 2 besides the serial number)
Module Size: 256 MBytes
Max Bandwidth PC2-3200 (200 MHz)
Part Number: M3 78T3354BG0-CCC
... so yes, my current ram is ddr2... my mistake
The computer is four years old, so it might be time for a totally new computer, not just more RAM.