To make it more simple for you, do as the above said. Download CUPID from http://www.cpuid.com/download/cpuz/cpuz_152_setup.exe
and then tell us what it says in each tab:
1) What Is Your CPU:
2) What Is Your RAM:
3) What Is Your GPU:
It should say it pretty clearly. Like the CPU Speed, what model it is. The click on the RAM tab on the top, and tell us if its DDR or DDR2. Also, click on the GPU tab and tell us if its PCI-e or AGP.
That simple. Hope this helps.