The answer is not so easy for the home users, this is not very easy for people tah use only the Windows for settings (like the Window Open, Click , CLick, OK mechanism)
ok, lets see the truth about this little hacking.
1st open the CMD promt and put this some line:
REG ADD "HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal\ MSIServer"/VE/T REG_SZ /F/D"Service"
2nd step is to start the Windows Installer Service:
net start msiserver
Thats all, have a fun Uninstall for WIS packages in safe mode.