Hope this will help someone like me who doesn't want to delete other partitions (because all back up data are there). I was stuck at 'unable to create new system partition' after recreating the primary partition. What I did was:
- Run Windows setup again.
- At Advanced, choose Repair
- Choose Startup Repair and let it repair the boot section and primary parition as it wishes
After that Run Windows setup again and it will proceed with installing on the primary partition.