My graphic card doesn't work

[Seether]

Hey guys hows it going.Recently i've had an issue with my dell laptop.It's a 500 series laptop.So long story short,my dad wanted to delete some stuff from the laptop as he needed some free space and i think he accidentally deleted the graphic card drivers.Unfortunately i don't remeber what brand my gfx card is.I've been downloading all kinds of drivers but none of them is recognised.Could you guys please help me,i don't know what else to do and i don't want to reformat it 'cos i have a lot of important stuff in it.

Thanks in advance