Saving DXDIAG report to text file using CMD

first goto windows+R→
cmd →enter
some time it may be like c:/User/user>
to exit from one directory type cd..
that is
c:/User/user>cd..
→
c:/User>cd..
→
c:/>
you can also use cd/ to exit full directory path
c:/User/user>cd/
→
c:/>

Now goto
c:/windows/system32>
to enter a directory type
c:/> cd windows
→
c:/windows>
to enter sytem32 directory from windows
c:/windows>cd system32
→
c:/windows/system32>
then type

dxdiag /t d:\aa.txt

that is c:/windows/system32>dxdiag /t d:\aa.txt

you can save from dxdiag gui window too
↓
Run→type→dxdiag→save all information