D3DX81ab.dll:

D3DX81ab.dll, C:\WINDOWS\system32, C:\Windows\SysWOW64\ Microsoft Dynamic-link library

D3DX81ab.dll ?

2. CMD
3. : regsvr32 D3DX81ab.dll Enter

RegSvr32.exe :

Regsvr32 [/u] [/n] [/i[:cmdline]] D3DX81ab.dll

/n -  /i
/s – 
/u - 
/i -  [cmdline];  /u, 

Snappy Driver Installer

:

:

d3dcompiler_47.dll d3d11.dll d3dx9_39.dll d3dx9-43.dll d3dx9_26.dll d3dx9_43.dll d3dcompiler_43.dll d3dx9_30.dll d3dx9_42.dll d3d9.dll d3dx11_43.dll d3dcompiler_46.dll d3dx9_31.dll d3dx9_38.dll D3DX9_40.dll D3DX9_41.dll d3dx9_33.dll d3drm.dll d3dx9_35.dll d3dx9_29.dll d3dx9_37.dll d3dx9_27.dll d3dx11_42.dll d3dx10_43.dll d3dx9_24.dll d3dx9_36.dll d3dx9_25.dll d3d10_1.dll d3d10warp.dll d3d10.dll