disable windows defender antivirus

I would like to suggest few troubleshooting steps:

Method 1: Disable group policy from gpedit.msc

1. Press Windows key + R.
2. Type gpedit.msc and click Ok.(it will open Local Group policy editor)
3. Go to Computer Configuration/Administrative Templates/Windows Components/Windows Defender.
4. In the right pane of Windows Defender in Local Group Policy Editor, double click/tap on the Turn off Windows Defender policy to edit it.
5. Select (dot) Not Configured or Disabled, click/tap on OK,
6. When finished, you can close the Local Group Policy Editor if you like.

If the issue still persist you can follow method 2.

Method 2: Disable group policy from registry.

Important: This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
How to back up and restore the registry in Windows

http://support.microsoft.com/kb/322756

1. Press Window Key +R.
2. Type regedit and click. (it will open registry)
3. Go to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender
4. Right Click on Window Defender to create a new Dword.
5. Click on New and Select Dword.
6. Type DisableAntiSpyware.
7. Right click on DisableAntiSpyware and click on modify.
8. Set the value to 0 instead of 1.

how to add notepad or word - excel in right click menu on desktop

For today’s lesson we’ll show you how to add Notepad to the menu, but you could add any applications you want instead. The first thing you’ll want to do is open up regedit.exe through the Start Menu search or run box, and then browse down to the following key:

HKEY_CLASSES_ROOT\Directory\Background\shell

The screen should look similar to this one if you are in the right place.

Next, you’ll want to create a new key underneath the shell key, the name of which is exactly what is going to show up on the desktop menu. Right-click on the “shell” key, and then choose New \ Key from the menu.

Give the new key the name that you want to show up on the desktop context menu. For this example we’ll be using Notepad.

Optional: If you want to assign an “Alt” key to this menu entry for quicker access, you can change the (Default) value on the right and put an & character in front of the key you want to use. For instance, if you wanted to be able to just use the N key to launch Notepad once the desktop context menu pops up, you can do this:

Personally I don’t find this terribly useful since you have to use the mouse to right-click on the desktop… may as well just use the mouse to click the item. Still, for completeness I’ve included it.

Next you’ll need to create the command key that will actually hold the command used to launch the application. Right-click on the new Notepad key, and then choose New \ Key from the menu.

Give this key the name “command” in lowercase.

To complete this step you’ll need the full path to the application that you want to launch. You can use Shift + Right-Click to get the Copy as Path menu item to find this more quickly. Note: of course, for Notepad you wouldn’t need the full path, but this is just an example.

Now click on “command” on the left side, and then double-click on the (Default) key in the right side to edit the string value.

Paste in the full path to the executable that you got from the “Copy as Path” step above, or you can put in the full path yourself if you’d like.

Once it’s done, it should look like this:

And right-clicking on the desktop will produce the new menu item… naturally, using this menu item should launch Notepad.

You can add as many applications to the desktop context menu as you’d like, just repeat the steps again with a new menu item name.

Excel 2013 Pro won't open files when double -clicking the file.

Per your post, seems that the DDE function appears to be corrupt. If the issue occurs for all of Office file, please try to repair Office programs or work around it by the following steps:

Go to Control Panel, Folder Options, File Types, scroll down to and select (XLS, XLSx, DOC or DOCx), click Advanced, select Open, click the Edit button. Now uncheck "Use DDE" and then put your cursor on the Application box, arrow all the way to the right and put in "%1" (include the quote marks), If there is a /dde remove it. Then OK your way out. Things should work quickly again.

If it only happens for Excel file, please try this:

Open blank File > Options > Advanced > General Section > Tick the option "Ignore other application that use Dynamic Data Exchange"

Thanks.