Somehow I have screwed up the sound on my work computer. It's a HP running XP, with the XP backup disc as a separate partition on the HD, and a DVD drive. I still get the Windows opening and closing sounds, but all other sounds are either garbled, absent, or at a VERY low volume. Also Explorer refuses to save any passwords. Anything easy I can try to do to fix this, without reformating the HD and reloading Windows and all of my programs?