In XP you could try going to the properties box for the taskbar and choosing to hide, and then unhide the audio icon. Or try "choose defaults".
In vista you could pull up the properties box and try that, but first I would try unchecking, applying, then checking the volume icon "always show" item under the notification area tab.
The explorer process is weird like that. If it doesn't work, you might try opening the task manager and killing explorer, then restarting it in the File/New Task "Run" box by typing explorer and hitting enter.
Either way, I would try getting the OS disk, create a copy of it on the machine, then slipstreaming any service packs into it so it matches the current OS as closely as possible, then repairing the OS with the new disk. That might fix any corruption issues that are popping up. Also run chkdsk /F from a command prompt, before you repair, if you decide to.
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We contend that for a nation to try to tax itself into prosperity is like a man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill
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