Normally after a bios update, when it says to restart your PC, you should shut it down and reset the bios. You should be able to find that info in your MB manual. Its basically a jumper or button that you use to reset it.
For that speed, the vcore should be around 1.1-1.2, 1.4625 is abit high.
If it was a B3 Q6600 I'd say the temps are acceptable, but since it's a G0 then they're not. I have a B3 myself so I'm not sure what the voltages for the G0 are like, but I have mine running at 3.0 GHz at 1.375 volts... keeping that in mind I'd say your 1.4625 is rather high.
It should be fine as its within spec (Q6600 can take up to 1.5v).
My Q6600 would run at 1.18v stock and now at 3GHz I have it at 1.225v stable (12 hours Prime95). So set yours low and see if its stable. If so try a lower voltage. I sat start with 1.25v and try from there.
Basically, yes... However not to many people will be able to tell you exactly what to change or how.
Not all bios are the same. For example, some MB's bios have options for perhaps a setting like "auto". On mine, I don't have that, its basically says 0.000. All I can do is raise the voltage. Some MB have the option to go lower then default voltage. And not all MB would have the same menu or sub-menu(s). So you will need to look at your MB manual, or go in the bios for yourself to figure that out.
Just do small adjustments, try to boot into windows and bring up CPU-Z (or what ever program your using) to see what adjustment you did for the vcore.