I realize it's only been 2 months since its release but it's already giving me a hard time more than a few times. Here's the kind of issues I encountered so far, in order. If you're considering upgrading, I suggest you wait until Microsoft polishes this thing clean. As of now it still feels unfinished in a lot of ways. - "Critical Error. Start menu and Cortana aren't working. We'll fix this the next time you sign in." and a "sign out now" button is shown on the window. The good thing is that it wasn't very persistent. I 'only' had to re-sign in 4-5 times until it worked, but this is too inconvenient and frustrating to have. - Search takes too long sometimes, probably an eternity if you just leave it. It works 70% of the time but the rest of the time it just stays like that forever and sits useless. - Wifi gets disabled out of nowhere for 10 minutes. It happened 3 times now and I don't even know why. Is it a driver issue? Is it my hardware? Is it just Windows 10? My money is on the last considering Wifi worked just fine before W10 and my drivers are always up to date. - On boot message: "No OS found on the harddrive." I don't remember the exact message but it was something like that. I tried the recovery disk image I made when I first installed the OS, but guess what, it's useless unless you run it from inside the OS itself. I don't know how that makes sense but that's how it works apparently. It bombards you with error messages every time you try something. God, I miss windows 7. It was so easy to use restore points. I don't know how it got fixed but I was just restarting all the time, each time changing boot order in the bios, but then it suddenly worked. But even when it worked, I was greeted by the first error again and had to re-sign in a few more times. I'm tired of this OS, seriously. It's given me such a hard time in such a short amount of time too. I'm considering going back to Windows 7 on my laptop but keeping Windows 10 on my PC (because of DX12) until next year. Anyway this was a rant of some sort, but also an advice to people who haven't upgraded yet. Stay away from this mess for a while. Did any of you receive any frustrating errors from Windows 10 so far?