I've doubled the memory on my W7 machine and getting some problems-crashes in many programs and my video card going wacky.

So I am updating drivers and I have some questions.

Oftentimes I cannot tell whether a new driver has been installed.

If you unzip it does it automatically install?

I use a program Driver Agent to tell me which drivers need an update, but after "installing" new drivers it gives the same info about which drivers need upgrade. YET if I go through Windows Device Manager on each device it says in all cases that I have the most recent driver. What do I believe?

I feel like I am in never never land.