dimm slots not working

I have 2 sticks of 8gb ram and I can only put then in A2 and B1 slots and the bios shows that I have only 8gb ram... So what can I do now? CPU: Intel I5-7400 GPU: GIGABYTE GTX 1050 TI CO Windforce MOBO: ASUS Z170 Pro-Gaming RAM: Corsair Vegeance LPX 8GB 2400Mhz (2 of them) PSU: Corsair RM650X

greetings! i was trying to resolve why my windows explorer was always crashing so i run a sfc/scannow then found out that my explorer.exe files are corrupted as shown in the sfc details log. my question is, Can the explorer files which are corrupted be fixed without installing fresh windows or...