Minimize, maximize and close buttons not working

i tried the 3 methods but still not working,,

Are you using any third party Desktop Management software? nView used to cause this problem. I do not know whether it still does.

This is a link to the latest version of nView:

http://www.nvidia.com/object/nview-display-us.html

Select the keyboard shortcut Ctrl+Shift+Esc, click the Applications tab and right click on a running application. You will find Minimise and Maximise options on the drop down menu.

Hello,

Thank you for visiting Microsoft Community and providing us with the detailed description about the issue.

As per the description, I understand that you are experiencing issue with minimize, maximize, and close buttons are not working on the system.

I certainly understand your concern and will try my best to help you.

I would suggest you to try the following methods and check if that helps.

Method 1:

To diagnose the problem whether any third party program or application is causing the conflict, I would suggest you to try “clean boot” and check if it helps.

Placing your system in “Clean Boot” state helps in identifying if any third party applications or startup items are causing the issue. You need to follow the steps from the article mentioned below to perform a Clean Boot.

**How to perform a clean boot in Windows**

https://support.microsoft.com/en-us/kb/929135?wa=wsignin1.0

Note: Refer "How to reset the computer to start normally after clean boot troubleshooting" to reset the computer to start as normal after troubleshooting.

Try to reboot the system and check if it helps.

If the issue persists, follow method 2

Method 2:

How to use the System File Checker tool to repair missing or corrupted system files, please follow the steps in the link provided below.

https://support.microsoft.com/kb/929833?wa=wsignin1.0

Note: System File Checker is a utility in Windows that allows users to scan for corruptions in Windows system files and restore corrupted files. This article describes how to run the System File Checker tool (SFC.exe)to scan your system files and to repair missing or corrupted system files in Windows 8.1 or Windows 8. If a Windows Resource Protection (WRP) file is missing or is corrupted, Windows may not behave as expected.

If the issue persists, follow method 3

Method 3:

Run a full computer scan with the Microsoft Safety Scanner to make sure that the computer is virus free.

Microsoft Safety Scanner, please follow the steps in the link provided below.

http://www.microsoft.com/security/scanner/en-us/default.aspx 

Note: Any data files that are infected may only be cleaned by deleting the file entirely, which means there is a potential for data loss. 

I hope this information is helpful.

Please do let us know if you need any further assistance, we will be glad to assist you.

Thank you.

Jayant