Welcome to the boards. Sounds like you have display issues related to your hardware. Update your drivers or it could be that you have an incompatible video card. And yeah you do need a three button mouse :x. Right click the image in the render view, File> save image, but I really would advise against saving as a jpeg since the jpeg compression in Maya is pretty terrible, you can save it as a tiff and convert it in Photoshop or something.