how to install autocad on window 7 how can we do if the auto cad is not working after installing how can we use a software of window xp software on window 7 or 8(7,8 software on xp)

1)          if auto cad is not installed in window 7 then try this method 

after installing autocad right click on autocad icon and select troubleshoot  compatibility 

then this program will come

select second option (troubleshoot program) 

2)           check the first statement and then select next

3)    then select window xp (service pack 2)

then click next

4)      click on start this program 

don't select next 

click on next when the auto cad completely start 

5)             after that select yes