Windows 7 Safe mode - Starting "Run Installer" and "Print Spooler" services

Windows Installer will not work under Safe Mode, this means that programs cannot be installed or uninstalled in safe mode without giving a specific command using msiexec in command prompt.

To make Windows Installer work under safe mode, you need to create a registry entry for every type of safe mode you are logged in to.

Run these commands from command line:

REG ADD "HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Network\MSIServer" /VE /T REG_SZ /F /D "Service"

net start msiserver 

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To Start Print Spooler
Method-1:

REG ADD HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Network\Spooler /VE /T REG_SZ /F /D Service

Net Start Spooler

Method-2:
Run Command prompt in administrator mode (right click and press "Run as Administrator"), and then run these commands.

Net stop spooler
sc config spooler depend= RPCSS
Net start spooler
exit

Reference:
1. http://www.symantec.com/connect/blogs/windows-installer-safe-mode
2. https://forums.techguy.org/threads/solved-enabling-print-spooler-in-safe-mode.1056317/
3. http://www.techsupportall.com/solved-print-spooler-error-1068-the-dependency-service-or-group-failed-to-start/