I've never heard PowerDVD installation would touch Boot Manager settings.
You said you have purchaed PowerDVD ages ago. Did it happen before?
If you already "Recreated" boot manager then boot function is still not OK. There might be other causes that lead to the booting problem. Check your PC HDD or Windows with your IT service first.
By the way, the patches that locates on cyberlink website is not supported to update Steam version.
This message was edited 2 times. Last update was at Jul 30. 2018 21:18