I have relatively new computers - a desktop that is about 3 years old and a laptop that is less than a year - so already running Windows 8, I received invitations to upgrade to Windows 10 for free.
I held my hand about taking advantage of this offer, concerned with what the change would mean. Would my programs suddenly stop working? Would I lose files? Would my entire system crash on me?
However, after reading a few expert reviews and dashing off a few emails to software providers to find out if their software would be compatible with Windows 10, I decided to take the plunge. I'm quite glad I did. For one thing, there is the welcome return of the Start menu. I never particularly liked the app desktop, always having to scroll those pages of apps just to find the one I wanted. Microsoft's new internet browser, Edge, is pretty good too, boasting several features that Chrome and IE lack. I don't seem to have suffered any compatibility problems either, which is a relief. I did, at first, seem to be experiencing a very slow start up, but whether that was just the initial changeover or whether all my programs were slowing it down, I can't say. After the upgrade, I did install about 5 programs that I hadn't used recently and after their removal, my computers load just fine.
So, all in all, if you are dithering over upgrading, then I say don't. Thanks to the beta testing by actual users, few bugs and glitches are anticipated, so there is little need to wait for wrinkles to be ironed out. If worst comes to worst and you do suffer some problems, you can always uninstall and return to Windows 8 or 8.1.
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