DirectX 9 or 10

start run dxdiag

ETA: Forgot vista does not have a run in start. So press WindowsKey and R then dxdiag
 
Where do I check on Windows Vista what version of DirectX is installed?

Vista will probably have DX10 installed but unless you have a DX10 display card all DX10 complaint games will fall back into DX9 mode :)
 
Is it safe to install the service pack? Wont I loose any information? Or will I have to install my programs again?

Vista's SP's work the same as the XP ones. It's like a patch. You won't lose anything.
 
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