I am using window 7 and I tried to upgrade my microsoft office 2007 to 2013. Dont know why since I installed Microsoft office 2013, my PC only can turned on in safe mode, I cant turn on in normal boot anymore.When I tried to run or uninstall Microsoft office, the error message showedBlockquote The Windows Installer service could not be accessed. Contact your support personnel to verify that the windows Installer service is properly registered.Blockquote Then I search online, someone said we can change configuration in msconfig.exe . So I tried to do so the setting like >> How to perform a clean boot to troubleshoot a problem in Windows 8, Windows 7, or Windows VistaAfter my next reboot, my PC just like dead and I cant boot the PC anymore.Any idea??