Yesterday I've set up Defraggler (I've used it before many times) to defragment my hard drives and turn off my laptop when it finishes. I haven§t installed/uninstalled/reconfigured anything that day.

When I've then turned the laptop on, I've got taskbar's "quick launch" area disappeared and all and every system tray (notification area) icons displayed (and the arrow-in-a-bubble usually folding to hide most of them gone). I've then successfully turned on "show quick launch" option, but "hide inactive icons" was already on. I've turned it off, applied, closed "taskbar and start menu properties", then opened again to turn the option back on, applied, restarted, nothing changes. Now I have to have all the system tray icons always displayed.

Any ideas what may the reason be and how to fix? The OS is Windows XP Pro SP3 with all the updates.