in windows you should be able to go into the properties or the item (my computer-->properties-->devices{or something similar, i dont totally recall}-->click it, then click change driver
point windows to the old drivers... and it will do what its go to do from there.
it might ask if youre sure you want to change because the one you have now is newer then the one your going to replace.
you might be able to do it by clicking the desktop and then properties---> settings..
but then again i have a cirrus 1mb vid card so i might be wrong..LOL