"Error 1719: The Windows Installer service could not be accessed" error message when you try to add or remove a program

Re-register the Windows Installer

Verify the location of the Msiexec.exe file on your hard disk. To do so:
a. Click Start, and then click Search.
b. Click All files and folders.
c. In the File name box, type msiexec.exe, and then click Search.
d. In the search results, make a note of the location of the Msiexec.exe file

 
Verify the location of the Msiexec.exe file in the Windows Registry. To do so:
a. Click Start, and then click Run.
b. In the Open box, type regedit, and then click OK.
c. Locate, and then click the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSIServer
d. In the right pane, double-click ImagePath.
e. In the Edit String dialog box, make sure that the string in the Value data box contains the correct path of the Msiexec.exe file on your hard disk that you determined earlier in step 1.

For example, if the Msiexec.exe file is located in the Drive:\Windows\System32 folder on your hard disk, the correct path of the Msiexec.exe file in the Value data box is the following path, where Drive is the drive where Windows is installed:
Drive:\Windows\System32\Msiexec.exe /V
Note If you are using Windows 98, the correct path of the Msiexec.exe file is Drive:\Windows\System\Msiexec.exe /V.

If the Value data box does not contain the correct path, make the appropriate changes to correct the path, and then click OK.
f. Quit Registry Editor.

 

Start your computer in safe mode, and then register the Msiexec.exe file. To do so:
a. Shut down, and then restart your computer.
b. Press F8 after you receive the following message:
Please select the operating system to start
c. On the Windows Advanced Option menu, use the arrow keys to select Safe Mode, and then press ENTER.
d. If you use a dual-boot or multiple-boot computer, select the appropriate operating system from the list that is displayed, and then press ENTER.
e. Log on to the computer.
f. Click Start,, click Run, type the following line, and then click OK:
msiexec /regserver


Note For 64-bit operating systems, you also need to reregister the 64-bit MSI installer. To do this, click Start, click Run, type the following line, and then click OK:

Drive:\windows\syswow64 msiexec /regserver
h. Shut down, and then restart your computer in standard mode.  

Reinstall the Windows Installer

1. Click Start, and then click Run.
2. In the Open box, type cmd, and then click OK.  
3. At the command prompt, type the following line, and then press ENTER, where Drive is the drive where Windows is installed and where %Windir% is   the folder where Windows is installed:
attrib -r -s -h drive:\%Windir%\system32\dllcache
For example, type
attrib -r -s -h c:\windows\system32\dllcache
Note If you are using Windows 98, type system instead of system32.		  
4. At the command prompt, type the following lines, pressing ENTER after each line:
ren msi.dll msi.old
ren msiexec.exe msiexec.old
ren msihnd.dll msihnd.old
 
5. At the command prompt, type exit, and then press ENTER.  
6. Restart your computer.  
7. Update the Windows Installer files on your hard disk to the latest version.  

Click to Download Windows Installer 3.1 Full Package