Hi Tibblez,
Seeing you are downgrading the first driver you should have installed is the Chipset driver
Here are some drivers that DELL supplies for your model:
http://support.dell.com/support/down...WLH&hidlang=en
Here is your owners manual. On page 181 it list some specs. This may help us Identify some drivers:
http://support.dell.com/support/edoc...RT722A02MR.pdf
The remaining drivers can be found here (Chipset, SM Bus, Audio, Blue Tooth)
http://support.dell.com/support/down...WLH&hidlang=en
It is a different model but is compatible to yours.
If you do not know what was installed as far as some drivers (Network, Communication) I would advise you run Everest under my signature. The report will tell you what is installed on your laptop. This will help you pick the correct driver.
Let us know how it goes.
Bill