More voltage won't correct a memory fault. Only replacing the RAM will fix that, and if you're running Norton on that work machine you're probably pwnd. Just coz someone paid for an AV solution doesn't mean it's worth a pinch of proverbial.
As for the OC'd system, it could still be an unstable 'clock. Not every chip will clock as well as every other. Some just won't go over n no matter what voltages or dividers you mess with. For that matter it could be the motherboard that's causing it. If the VREGS (or whatever parts) aren't up to it, they're not up to it and that's all there is to it.
The guys who win overclocking competitions aren't "script kiddies" that just change settings to a formula, they're artists who know their kit inside out and go out of their way to find the right steppings of the right chips, the right boards and everything else. Even after all that, the best guys still sometimes get a chip that just won't clock like it should.