There are two hardware upgrades you could do to improve your PC's performance.
Migrate the Win 10 installation to a SSD. Samsung SSD's ship with, or you can download migration software. Or you can use free software available from ParagonorMacrium to move the Win 10 install to any new SSD.
Add more RAM.
These two upgrades will give you the biggest bang for the money spent.
You could also upgrade the processor but your PC's biggest bottleneck is the SLOWWW HDD.