Hi Salim.
Did you try this:
Error 1719: Windows Installer Service could not be accessed
There you can find how to re-register Windows Installer. If that doesn't help, you can try with re-installing Windows Installer.
If this doesn't help, you can try with checking your files with sfc /scannow:
1. Click "Start", click "All Programs", click "Accessories", right-click Command Prompt, and then click "Run as administrator". If you are prompted for an administrator password or for a confirmation,
type the password, or click "Allow"
2. Type the following command, and then press "ENTER": "sfc /scannow", (without the quotes)
[The sfc /scannow command scans all protected system files and replaces incorrect versions with correct Microsoft versions.]
A message will appear stating that 'The system scan will begin'. Be patient because the scan may take some time
3. If any files require a replace (SFC) will replace them. You may be asked to insert your Windows 7 DVD for this process to continue
4. If everything is okay you should, after the scan, see the following message "Windows resource protection did not find any integrity violations"
5. After the scan has completed, close the command prompt window, restart the computer and check.
Hope this helps.
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Windows Installer issue on Windows Server 2008 R2
