I have a 670 and I did update to the new beta drivers like a week ago, I accidentally hit express though. That is kind of nagging me.

But am I supposed to really scrub out and remove the old drivers and install the new drivers? Or am I gonna be okay?

just uninstall and reinstall again if you want peace of mind.  Otherwise it's usually fine.

If you use nVidia's self-installer it should come with an automatic cleaner that uninstalls old drivers.

@ck1nd said:

If you use nVidia's self-installer it should come with an automatic cleaner that uninstalls old drivers.

Not really, it only goes so far. To really uninstall them you have to do some pretty drastic things.

But if you aren't having problems, don't worry duder. You'll notice it if things don't go well.