For SHIV it syas you need
The minimum requirements to run SH4 would be: 2GHz processor (Pentium IV or equivalent AMD Athlon), 1GB of RAM, DirectX 9 video card with Pixel Shader v2.0, Vertex Shader v2.0 with 128MB of RAM, DirectX compatible sound card and around 5.5-6GB of space on your HDD.
The game options will allow you to activate or deactivate different visual aspects that can increase or decrease performance. Of course, in the minimum requirements PC you will run with most options OFF.
A recommended system will have: 3GHz processor, 2GB of RAM, DirectX 9 video card with PS 3.0, VS 3.0 and 256MB of RAM.
AND I have
XPS410
Windows Media Center/WinXP
1GB Memory
256MB nVidia Geforce 7300LE TurboCache(video Card)
So My Question is how can I tell if I have a PS and a VS ?