Sorry to sound crass, but if you need help loading a preset, then you really need to look at the manual and some tutorials. V-Ray is not a magic rendering engine. You will never have clean noise-less renders if you don't learn the parameters of the engine and understand them clearly.
If you are using 2.0, then this is how you load a preset.
http://help.chaosgroup.com/vray/help/sketchup/150PB/tutorials_preset.htm
Bookmark this page and reference it... a lot.