The Acer computer supports DDR3 memory only. DDR2 memory will not fit nor work with the computer.
Where did the memory from? Do you have a web link to the memory?
We need more details of the memory before we can confirm compatibility. Memory part number is preferred, if there is one on a label. And the memory part number does not start with DDR3 or DDR2. The part number might start with a C, or a K, or an H, or an F, or a T, or maybe some other letter, or maybe a number.