If your computer still requires you to press CTRL ALT DEL upon login, this simple guide will teach you how to disable it. Note that this will require administrator access and it might not work on Windows Home editions as it requires to modify local group policies.
Browse to Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options
Locate the policy called “Interactive logon: Do not require CTRL+ALT+DEL“
Doubleclick the policy and set it to Enabled
Starting from your next restart, you should no longer be required to press CTRL+ALT+DEL at the Windows login prompt.
If you’re running on older Windows version the policy might be called “Disable CTRL+ALT+DEL requirement for logon”
I just had to install some old legacy software on a new Windows 10 computer. Vendor says it “should work”, but apparantly not without some challenges.
Fast forward ten minutes. Application installed successfully. A couple dll error messages during the setup but I happily ignored those and went on my way.
I cross my fingers and start the application…. nothing happens. Try again. Reboot. Still nothing. Login as local administrator account and reinstall software. Nothing. Start in compatibility mode for XP and set to 256 colors… nothing. Run as admin. Nothing works, you know the drill.
So naturally our next point is to either give up or go all in and fire up ProcessMonitor. Unfortunately we really needed this to work so ProcMon it is.
1) First of we have to set up some filters. Click on the Filter button as showed in the picture below:
2) Set the Process Name == executable filename.exe and Result != SUCCESS. Leave the default filters as they are.
3) Now clear the log for good measure and start the troubling application. ProcMon will now be populated with every single failed event processed by the application.
In the picture above I started to notice a pattern with .NET framework. Then I remembered we had some other software which required .NET framework 3.5, and that’s not easily available on Windows 10. So the next thing I did was to install .NET framework 3.5 and the application worked!!
See this other post for .NET 3.5 install instructions:
If you’re trying to install .NET Framework 3.5 using the regular installer, it’ll most likely say you already have a newer version installed. Luckily you can still install it using some other methods which I’ll quickly go through today along with its probability of success (because for reasons they only work sometimes).
Using Windows Features – probably won’t work
Open appwiz.cpl (Programs and Features) and click on Turn Windows features on or off 
Mark the checkbox for .NET Framework 3.5 (includes .NET 2.0 and 3.0)
Using DISM online version – might work
Open command prompt as administrator
Enter command: DISM.EXE /Online /Add-Capability /CapabilityName:NetFx3~~~~
If it works you’ll see a progress bar for the download + installation.
Using DISM offline version – works most of the time
Get a copy of the .NET Framework 3.5 installation .cab file.
You can find this inside the Windows 10 install .iso file (open the .iso file in 7-Zip or any other package utility and copy the microsoft-windows-netfx3-ondemand-package.cab file from \sources\sxs\ directory to a place on your drive, like C:\Temp
Enter command: DISM.EXE /Online /Add-Package /PackagePath:C:\Temp\microsoft-windows-netfx3-ondemand-package.cab
If it works you’ll see a progress bar for the installation.