|Donwnload the driver from here and install it:|
You may need to change the product if it does not default to Dimension 4500S
Use the "change your product" link to correct it:
When you click on it you will get an option window with 3 ways of choosing your product.
Using your Service TAG if you have one is the quickest and easiest.
If you do not know your service tag id then click on "Select model"
If you select model then choose: Desktops > Dimension > 4500s
If after all that you do not appear to be at the right place use the link below and select "Drivers & Downloads" and go through there:
☺ When everything else fails, read the instructions.