Are you using 1.,5.26 patch btw?
You can type dxdiag in the search box
or you can type system information
There are many ways, i seemed to forget em all

and is it windows 7 u r using
i need information on the RAM, graphics card(display) and its drivers and what model it is etc. And your CPU.
What HP dv4 are you using? Do you know the Model of your hp dv4