Rendering on a background

Hello,

I'm a student Product Design and I've got e few problems with my renderings,

when i want to render my object on to a background i'll get a sort of white plane next to my object.

this is what I want to render and this is what I get

There is a white / colored 'plain' next to my object and when i rotate it, the 'plain' rotates too.

Do anyone know how i solve this?

thx

SolidworksPhotoview 360