Vista Users - is this how Vista usually works? Please see details.

I recently bought a computer running Vista Ultimate 64 bit. I experience little glitches every now and then. My task bar has a mind of its own – occassionally, an icon can appear in duplicate or not at all (I’ve checked the settings); earlier today, the volume control failed to work, desktop dream scene goes to the default black screen at the slightest “hiccup”... Is THIS the kind of problems people complain about with Vista? I’ve run anti-virus checkers and all turn up negative.