Windows Installer Service Could Not be Accessed


Your computer aborts installation progress with an error. Learn simple techniques to get rid of this error and continue with the installation process.

Download Diagnostic

You’re just 3 steps away from fixing this problem…

1. Download and install the Diagnostic

2. Run full scan

3. Perform system clean-up & repair

Estimated download time: 10 Seconds

What is Diagnostic? How does it work?

Update Device Drivers

In most of the cases reported, this issue was caused due to outdated device drivers – software that facilitate communication between your operating system and hardware. Update the device drivers using the Free Wise Driver Care. Restart your computer after successful completion.

Register Component Files

Some of the installer components are not registered in Registry.


For Windows 10/ 8.1/ 8:

  1. Open the Start Screen.
  2. Type “Command Prompt” in Search Box.
  3. In the case of Windows 8.1, make sure “Everywhere” option is selected from the drop down box. If you’re using Windows 8, click Apps icon.
  4. You’ve the Search Result on your screen. Right click Command Prompt icon, and click Run as administrator icon at the bottom of the screen.
  5. Execute following commands one by one, and then restart your PC.
  • msiexec /unregister
  • msiexec /regserver
  • EXIT

For Windows 7/ Vista:

  1. Click Start button on Taskbar.
  2. Type “Command Prompt” in Search Box.
  3. Right-click that in Search Results; choose Run as administrator from context menu options.
  4. Refer Step # 5 under Windows 10/ 8.1/ 8 user’s section.

Reinstall Installer from Scratch

The Windows Installer files mentioned below are likely to be corrupted. Stop Windows Installer service, remove those files and reinstall the tool again.


For Windows 10/ 8.1/ 8/ 7/ Vista:

  1. Open up Command Prompt as administrator. (Refer Register Component Files section)
  2. Run following command:
  • net stop msiserver
  1. Exit out of the screen.
  2. Double click Computer icon on Desktop.
  3. Open following folder:
  • C:\Windows\System32\
  1. Delete following files:
  • Msi.dll
  • Msihnd.dll
  • Msiexec.exe
  1. Visit Microsoft Download Center and download the latest version of Windows Installer. (Use the Search box on top)

Change Service Startup Type

You may have to modify the Startup Type of Windows Installer service. It requires editing Windows Registry entries, which we will do automatically using Command Prompt.


For Windows 10/ 8.1/ 8/ 7/ Vista:

  1. Open up Command Prompt. (Refer Register Component Files section)
  2. Execute following commands and then restart the PC:
  • net stop msiserver
  • REG add “HKLM\SYSTEM\CurrentControlSet\services\msiserver” /v Start /t REG_DWORD /d 2 /f
  • net start msiserver
  • EXIT

Determine System Date-Time

Make sure your computer’s date-time settings are properly configured. Correct the mismatches using Date-Time dialog.


For Windows 10/ 8.1/ 8:

  1. Press Windows Key + X; choose Control Panel.
  2. Click Clock, Language and Region icon.
  3. Click Date and Time icon.
  4. It opens up a new dialog.
  5. For Windows 10, click the Change button, set up appropriate date-time. For Windows 8.1/ 8, click the Change Date and Time button, set it appropriately.
  6. Click OK | OK.

For Windows 7:

  1. Click Start, select Control Panel.
  2. Click Clock, Language, and Region | Date and Time.
  3. Refer Steps # 4-6 under Windows 10/ 8.1/ 8 user’s section.

For Windows Vista:

  1. Click Start; type “Date and Time.”
  2. Press ENTER.
  3. Refer Steps # 4-6 under Windows 10/ 8.1/ 8 user’s section.
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