To resolve the error 0x8004FF01 follow these steps:
- Update 'Windows Installer 4.5 Redistributable'.
- Ensure that the Windows Installer service is set to automatic and started [to "Start-> Accessories-> open the DOS prompt, or go to 'run' and type services.msc * without * asterisks, to 'submit'].
- Check, the item about in the window that opens, if it is enabled automatically in "Windows Installer", if not click on and start the service.
- Final check: Open a DOS prompt or Run and give the command:
msiexec / regserver
For checking if it's installed version 4.5. Now it should no longer give the error. If [impossible] that the error should reappear then try to reinstall Microsoft Security Essentials.
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