Strange occurrence yesterday: NIS-2009 automatically re-installed itself.
I usually power-up my PC and then leave while it boots and updates. When I got back to it yesterday, I had a new NIS shortcut icon on the desktop. Because NIS autoloads, I don’t bother keeping a NIS desktop icon. I have the NIS icon on the notification area of the taskbar, but not on the desktop itself. NIS seemed to be running fine. None of the NIS settings were changed, so I just deleted the new desktop icon.
Later in the day, I went to the Control Panel to remove a program, and noticed that NIS was on top of the Add/Remove programs list, with an “installation” date of 2/3/2010. Unfortunately, I had cleared the NIS History log before I noticed the new installation date, so I couldn't trace what NIS had done.
I’m GUESSING that there was a NIS auto update that downloaded and installed on 2/2, but it needed a reboot to be fully installed. When I powered-up the PC on 2/3, NIS completed the installation and for some unknown reason, it re-installed itself. 
I’d appreciate it if someone who is running Vista with “golden-oldie” NIS-2009 would check their Add/Remove programs area to see if their NIS was also magically “re-installed” recently.
Any good guesses as to what might have occurred? Leaving town for a few days, but will check back for guesses next week.
Thanks,