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Errors: This operation has been cancelled due to restrictions in effect on this computer. Please contact your system administrator.

Error: "This operation has been canceled due to restrictions in effect on this computer. Please contact your system administrator."

Solution:

Resolution:
Note Use this method only if the earlier instructions for each browser do not work to resolve this problem. Export the registry key from another computer
  1. Click Start, and then click Run.
  2. In the Open box, type regedit, and then click OK.
  3. Locate, and then click the following registry subkey:
HKEY_LOCAL_MACHINE\Software\Classes\htmlfile\shell\open\command
  1. On the File or Registry menu (depending on your operating system), click ExportSee image.
Collapse this imageExpand this image
  1. Note the location where the file will be saved. The registry file can be saved directly to the hard disk or floppy disk.
  2. Type a unique file name, and then click Save.
  3. Exit Registry Editor.
Import the registry key
  1. Copy the exported registry key to the desktop on the problem computer.
  2. Double-click the .reg file.

    You receive the following message:
Windows 7 - Are you sure you want to add the information in drive: location file was copied to\file name.reg to the registry?

Windows 8 - Adding information can unintentionally change or delete values and cause components to stop working correctly. If you do not trust the source of this information in C:Users\<yourlogon>Desktop\regkey.reg, do not add it to the registry.
  1. Click Yes, and then click OK.
Verify that the String (Default) value of the "HKEY_CLASSES_ROOT \.html" key is "htmlfile"
  1. Click Start, and then click Run.
  1. In the Open box, type regedit, and then click OK.
  1. Locate, and then click the following registry subkey:
    HKEY_CLASSES_ROOT \.html
  1. Make sure that the value of the String (Default) is "htmlfile". If it's not "htmlfile", right-click (Default), click Modify, input htmlfile in the Value data box, and then click OK

  1. Exit Registry Editor.

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Problem: 

Setup cannot find office.en-us\dwtrig20.exe during office installation

Solution:

Method 1:

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b) After installing office, re-install skype.

Method 2:
a) Browse disk by right clicking on it with mouse.
b) Double click on setup.exe file from the same location.

Method 3:
Note: Take backup of your registry before modifying it. 
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a) Edit the registry.
HKEY_LOCAL_MACHINE > SOFTWARE > MICROSOFT > OFFICE Delete the keys (items) you find in the OFFICE folder but not the sub-folders. This removes traces of previous installs to avoid possible conflicts when installing the new version of Office.

b)HKEY_LOCAL_MACHINE > SOFTWARE > MICROSOFT > OFFICE > DELIVERY > SOURCEENGINE > DOWNLOADS
Delete the keys (items) you find here.

How to add Startup items to Windows 8.

Problem

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Solution

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Press the Windows key
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OR (as commented by Rick) Press the ‘Windows key’+'R’
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Navigate to “\Microsoft\Windows\Start Menu\Programs\Startup”. The full path should now look something like:
“C:\Users\<user-name>\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup”.
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Excel 2013 right click doesn't work in spreadsheet.

Problem:

Excel 2013 right click doesn't work in spreadsheet.

Solution:

Check if excel works in safe mode.
1. Hold Windows key + R.
2. Copy and paste, or type the following command in the Open box, and then press Enter:
Excel /safe

Note: There is space between Excel and / If Excel safe works, disable the add-ins following steps mentioned below and determine the problem causing add-in: 
Try deleting following key from registry.
Excel 2007. Go to regedit and delete Options entry from HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\ and verify the result.
Note:
• Hold Windows key + R.
• Copy and paste, or type the following command in the Open box, and then press Enter:
regedit
HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Options
right click on Options and delete it.
Note: Ensure to back up the registry before any modification or deletion.
a) Locate and click the key or subkey that you want to back up.
b) Click the File menu, and then click Export.
c) In the Save in box, select the locati…