I had the same problem...my volume icon disappeared, even though in the Control Panel, it was supposed to be showing. I also right-clicked on the Taskbar for Properties, etc. and made sure to click both the volume icon and my laptop's battery icon to "always show". Didn't work. I tried your reference to the tweak, and I got it to work for the volume icon (I was so pleased with myself), for about 24 hours. Now, it's gone again. I keep re-setting the registry, but not only does it not take effect, but when I re-boot, the registry keeps going back to the other setting.
After doing this a couple of times, I just now lost my chevron that you click to show the inactive icons.
Really, the battery one is the WORST, since I've lost my "power low, need to switch" (or whatever the exact wording is), and my laptop has hibernated unexpectedly on me! Grrrr...
I checked out the Kelly's Korner for the battery thing, but I didn't seem to find anything, and a regular Yahoo search didn't turn up a whole lot, either.
Any help is appreciated, though a system restore seems a bit extreme to me, too????
BTW, I'm running XP Pro SP3.
Edited by knitwendy, 21 October 2010 - 01:42 AM.