Just posted somewhere else, Foxit
. A very good PDF reader with a small footprint and memory usage, it also allows editing (with a stamp) and some of the extras (available in the paid version) are useable as 30 days trial.
For graphics card drivers it's best to uninstall the old ones first before installing the new ones, Driver Sweeper
does this quite handily. It'll also take a snapshot of your desktop settings and icons to remedy the "800x600 clump" that Nvidia favours