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"Windows Installer Service could not be accessed" error message when installing application

Error: 
"Windows Installer Service could not be accessed" error message when installing application.
Solution:
Method 1: Unregister and re-register the Windows Installer
Click Start, click Run, type MSIEXEC /UNREGISTER, and then click OK. Even if you do this correctly, it may look like nothing occurs.
Click Start, click Run, type MSIEXEC /REGSERVER, and then click OK. Even if you do this correctly, it may look like nothing occurs, or you may briefly see an hourglass. After you run this command, the operation is complete.
Try your Windows Installer-based application again.
Method 2: Verify the DCOM permissions
This method involves changing the DCOM default impersonation level to Identify, removing the Msisip.dll file, and then reinstalling SP 3 for Windows 2000.

To do this, follow these steps:
Click Start, click Run, type dcomcnfg, and then click OK.
On the Default Properties tab:
In the Default Authentication Level list, click Connect.
In the Default Impersonation Level list, click Identify, and then click OK.
Click Start, click Run, type explorer /select, %windir%\system32\msisip.dll, and then click OK.
Rename the Msisip.dll file as Msisip.old.
Reinstall Windows 2000 Service Pack 3.
Method 3: Give Full Control permission to the SYSTEM account
Start Windows Explorer, right-click the computer's root hard drive, and then click Properties.
Click the Security tab, and then click Add.
In the Select Users, Computers, or Groups dialog box, click the SYSTEM account, click Add, and then click OK.
Under Allow, click to select the Full Control check box, and then click OK.
Click the TEMP folder and then verify that the SYSTEM account has full control.
Method 4: Verify the registry permissions
Click Start, click Run, then type Regedt32.
For each of the registry hives, follow these steps:
Select the hive.
For Windows XP, on the Edit menu, click Permissions.

For Windows 2000 and Windows NT 4, on the Security menu, click Permissions.
Verify that the SYSTEM account has been added and that it has Full control. If it does not, add the SYSTEM account with Full control.
Method 5: Fix the broken security key for the MsiServer service
Start the computer by using Windows 2000.
Click Start, click Run, type regedit.exe, and then rename the following key to Old_Security:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSIServer\Security
Restart the computer (you must do this).
Run Instmsiw.exe for installer 2.0 again; this corrects the broken security key for the MSI service.

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

Problem: 

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

Solution:

Method 1:

a) Uninstall skype form control panel.

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:
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a) Edit the registry.
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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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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.
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