My first reaction was that nothing really changed. The tiles were a little more crisp and there was this annoying "Start Button" at the bottom left of the desktop screen. When you don't have a touch screen and you navigate using a mouse this thing gets in the way of left and right scrolling while you are in a app. Personally, I like the way it popped up before. For you who expected the start button to bring back Windows 7, you will be very disappointed. When you click on the "Start Button" it takes you to the start screen. For all you techies who couldn't find anything when Vista took away the word "My" from Documents. Pictures, Videos and Music - get over it. Things are going to change.
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The search is the first thing I tried. It didn't seem to get the things I was looking for. That was just me being a little too excited to try it. It took 8.1 a bit of time to index all the data. After a few minutes it was terrific it found things
I didn't even know were in my data files.
I had one little problem - My HP Control Center lost my printers. Windows 8.1 knew they where there but HP seemed to have lost them. Not a big problem - I just had to run HP's "Add a Device" and it re-discovered them.
Overall, Windows 8.1 - Terrific. Nice job Microsoft!