WIndows 8.1 64bit, Windows Installers stalls with any install, updates or third party programs. Third party program installations work if I restart in safe mode. Updates don't as they cannot be installed in safe mode and require normal mode.

Been happening for months now. Some installations after a long time finally proceed, others dont. 

Already trying uninstalling antivirus (Bitdefender) with no result.

Thanks

Hi

Could you check this issue under clean boot?

Also try this fix tool it repair corrupted registry keys.

https://support.microsoft.com/en-us/mats/program_install_and_uninstall

Regards,

D. Wu