cannot login windows 10 and click start menu

I am using Windows 10 for working. On that computer, I cannot click "start menu" and the app can't be opened. When I open the pictures in the app and the picture app can open the pictures. However, the app quits immediately. Windows Explorer and Window (Microsoft Office 2013) can be opened. I tried to delete the user account which is using the administrator "account type" and enable the user Administrator. and the crying drama comes and the screen starting blinking continuously. this is the youtube video after I restarted. I also tried to enter Safe Mode, but the Windows 10 does not allow me to do this in starting up phase like old Windows.

What should I do?

Hello argon007 Welcome to the Ten Forums!

You will need to provide a litte more information on things like was 10 an upgrade over a previous version? Or was 10 put on fresh like a Clean Install of Windows? The description alone suggests the upgrade was the route taken and came out bad! Missing Start buttons, not able to open up the Start menu, not able to open up anything in the Start menu like the Start>AllApps is a good indicator of a bad upgrade!

Deletion of the existing admin account wouldn't be any solution while a fresh install of 10 will likely be what is required there. Generally the problems you are seeing along with the ones being mentioned as further examples are a clear indication that the upgrade install failed to see a number of essential ingredients be fully unpacked to the drive during the 10 install! The fast and easy solution will require a fresh copy of 10 to remedy this.

For the time being trying to boot up in Safe mode long enough to see a brand new admin account created would be a project on it's own there. The alternative if you are able to bring up the F8 boot menu where the repair and recovery options would be found is to use the Refresh PC option with the guide for that seen at Refresh Windows 10 - Windows 10 Forums

If the upgrade was seen by way of the 10 app and you never saw the 10 media made up you will want to see that taken care of in order to be able to see the fresh copy of 10 go on. The present Threshold 2 Update updated since the initial November release even further would require an 8gb flash drive for the 5.48gb size of that download which is both editions Home and Pro in both the 32bit and 64bit options for being able to update all 10 installs from the previous build(s). Windows 10 ISO Download - Windows 10 Forums

The Tech Bench Program's download page also referred to in the guide there sees the smaller 32bit only and 64bit only Dual Edition downloads where you simply choose the 32bit or 64bit download that contains Home and Pro in each.

Here having the Threshold 2 update on and wanting to keep that going on the main build while running the Insider Preview builds on a second machine as well as on VMs I ended needing to replace the TH2 a few weeks back with an Insider build just so I would be able to name new folders as well as rename existing ones. Hopefully I will be able to keep the TH3 on longer rather then the need to upgrade each newer General Update build every few months after it gets buggy!

If every 10 system there is using the exact same key that would be a volume license type key typically seen used by businesses as well as larger corporations. One key fits all. But if each machine had their own key by chance you would need to use the same again on the fresh install since the key is tied to that machine. Volume licensing allows for upwards of 100 machines or more depending on which option a company selects when purchasing from MS.

If the key for the previous version was used on the exact same machine you shouldn't run into any problems at all. But for some other system like any OEM machine the key is tied to the hardwares. A retail key for a disk set bought separately even an OEM for System Builder's key can be transferred over to a clean install of the same media being used however by calling into MS for machines you own only however. With progressive builds here I saw that mostly during the XP years and when the Vista build built fresh for Vista saw XP as well at first that was first to see 7 after the beta and RC builds onto the retail until going DOA in early 2010!

Ut oh! was the word where a new build was then planned out and still in use now years later! The retail 7 key was transferred over to this build at the time and now sees 10 at first with the 7 key until getting a new 10 key.

For a company however that's a totally different ball park there. If the company has a key for a previous version used on that machine you could then use that. But if 10 has already been activated you need worry at all! You simply skip past entering any key and watch as 10 is activated by Digital entitlement on it's own since the MS activation servers already have that machines id tag!

I'm glad to hear that things went well for you as suspected they would. And by means don't hesitate to jump back in here if you run into any other problems or simply need to ask for information on something. :)