Draftsight crashes

I have downloaded draftsight, but whenever I start using it always crashes out after a couple of minutes when I am still drafting. An error message "display driver igfx stopped responding and has successfully recovered" shows up before automatically closing down.

I have updated my graphics driver and have tried reinstalling,but no change.

I am using windows vista. Any help would be most appreciated to avoid a return to autocad.

Thanks

Colin