I used to leave my computer working on something overnight when I used Windows 7 and it would stay on. Now, with this danged Windows 10, the darned thing restarts and kills whatever I had working. I have looked on the Internet but the solutions there seemed to complex for me to follow. There has to be a simple way to prevent the computer from restarting when Windows 10 wants to. Please help.

Efficient Googling can be a lifesaver:
https://www.google.ca/search?q=preve...hrome&ie=UTF-8

This absolutely does not work. So I would appreciate it if someone else provides an answer. Some of what this presented fix talks about choices that are no longer present since the Anniversary Update. I did Google efficiently and had already found this answer.

Here are the instructions to disable auto restarts for windows 10 Pro and Home editions. If you have a different version (education, enterprise) the process is different - update your question to that effect and I'll add that info.
There are two methods provided. The first is Pro only. Win 10 home doesn't have the group policy editor so it has to be configured via the registry. This registry method will work for both Pro and Home.
I confirmed that this works on the Anniversary update version (win 10 pro). There is one caveat - a user must be logged in for this approach to work.
Win 10 Pro:

1. Press win+R then type gpedit.msc and press enter
2. This will open the group policy editor. Browse through the 'tree' to the following entry: Computer Configuration > Administrative Templates > Windows Components > Windows Update.
3. Look on the right panel and search for the option named No auto-restart with logged on users for scheduled automatic updates installations.
4. Double-click on it, then change the radio button in the popup window that will appear from not configured to enabled and click OK.
5. To make the system immediately apply the changes you just made, press WIN + R again and issue the gpupdate /force command

Win 10 Pro (alternative method) and Home:

1. Press win+R; type regedit and press enter.
2. Browse to the following registry entry: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Win dows\WindowsUpdate\AU
3. If you do not have a WindowsUpdate and/or AU entry, you need to create them. Follow the 'source' link below for add'l info on how to do this.
4. Inside the AU key, create a new 32-bit DWORD called NoAutoRebootWithLoggedOnUsers, then double-click on it and set its hex value to 1.
5. You'll have to reboot for the change to be applied.

Another alternative - home or pro

If for whatever reason the approach above doesn't work, you can get around automatic reboots by changing your windows update settings so that you only download updates automatically and it requests approval before installing them. Once you approve installation you are at the mercy of when Windows reboots, but you have the ability to otherwise indefinitely delay it.
To change this setting:

1. Press win+R; type regedit and press enter.
2. Browse to the following registry entry: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\WindowsUpdate\Auto Update
3. Change the value of that key to a '3' (which configures windows update to download updates automatically but require user confirmation before installing them).

Source:
Disable Automatic Restarts in Windows 10 Home Anniversary Update - Super User

Are yu sure this is an updae problem? Do you have a nvidia enabled video card? Win10 doesnt like nvidia and reboots from corruption of the video card.