I have an Asus gaming laptop, G72GX. It ships with both Realtek and Creative Technology for sound. *Any* use of Creative will cripple Steam to the point of crashing the computer when Steam attempts startup.
It took me three reinstalls of Windows over the course of two years to learn this was why Steam eventually crashed my computer, and the problem is easily resolved by uninstalling Creative.
The posts I found about this were from 2011! Why didn't Google find them for me back when I first had the problem? I certainly looked for a solution short of reinstalling Windows. Wasn't even looking for it when I found it.
Now that I know how to keep Steam and my laptop on friendly terms, I really do like Steam. I've taken advantage of the sales to get Bioshock (played, loved), Bioshock 2 (not played yet), Fallout 3 (still playing, haven't finished, too much to explore), Fallout: New Vegas (not played yet), and Mass Effect 1 (playing, love the trilogy).
Then there's Skyrim.
It's in a class by itself, especially when modded to suit individual tastes. I expect my next showdown with Alduin to be far more difficult, as it should be. Deadly Dragons! lore friendly version.