hey. when i open counter strike source it comes up a message box that says
"your videocard is unknown in our database. this means you cant play the game with ordinary stability."

Buttons : continue anyway , upload details (cant be clicked) , quit

and then if i press continue anyway the game lags as hell.
and the thing i cant understand is that this just suddenly started happending.
it never did before. and it didnt lag before neither.

do anyone know what i may do to fix this if its possible?
if so please post what to do.

oh and i have this laptop : acer aspire 8935g


PS. sorry for bad grammar. i had to translate myself