I've found out that as a consultant for many of my clients, the Windows Update function solves many general issues that could be time consuming for me to find out.
But something happened once: One of my customers performed a "refresh" installation of Win98SE on a computer that had a dead battery. So, the time and date were settled somewher on year 2001 or so. I didn't noticed and then I arrived to optimize the PC... Of course, I ran Win Update. After that I noticed the date of the PC and fixed it. Several days later, I performed a Win Update again but had trouble on it because the SSL secure conection does not allow the scan if more than 100 days have past. I don't like that... but it gives me also the doubt about how much a computer could be tracked by MS.
I just wanted to share this.
After all, the online support from MS gave me the hint, but I also noticed that some other strange things happen over troubleshooting Win Update, that I was not aware of... There's always a way of course.