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A couple of things I should have mentioned earlier, if you use memory cards ensure that they are weather proof, I use Sandisk Extreme cards that continue to work at full write speeds whatever the outside temp,(hot or cold) many cheaper cards will write at much slower speeds and some won't write atall!
Snow, in good sunlight, is bright white, but many cameras will see it as grey, if your camera has an exposure compensation control seen as a button marked -/+ then try turning it to the + side, this should turn your snow white again. Yes you can do it on your PC if you have Photoshop or similier, but come on, as photographers can't we do it in camera first?
Any problems or questions then reach me via this thread, or my website or e-mail, details are here under my name.