diag.dll:

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

diag.dll ?

2. CMD
3. : regsvr32 diag.dll Enter

RegSvr32.exe :

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

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

Snappy Driver Installer

:

:

dxgi.dll DAO350.dll dwmapi.dll dao360.dll DBGHELP.dll dsound.dll DWrite.dll DSETUP.dll d2d1.dll dhplay.dll d2client.dll dcomp.dll dxva2.dll dx8vb.dll d2multi.dll d2sound.dll dwmcore.dll d2glide.dll d2win.dll D2gfx.dll d2cmp.dll d2common.dll dx7vb.dll d2mcpclient.dll d2net.dll d2game.dll -db-cyb-.dll d2maphack.dll d2launch.dll d1i971ne.dll