It seems the crashes are getting more consistent at least. Let's narrow this down.
It always seems to be after I've been in-game for a short period of time (10-15 minutes). The most frequent cause is attempting to use a hardline or an Archivist. The process is always the same: First the sound makes a weird crackling noise, then goes into a loop of whatever sound it was. The screen then goes black, and comes back as a BSOD. The error message is that an attempt was made to write to read-only memory. The guilty party is nv4_disp.dll - my video card driver.
So we know it's not bad hardware now, so what the hell is going on? Remember, I didn't change anything when all of this started, I just went from being able to play for as long as I want, to total repeated failure.
I'm not sure what else to suggest, it's stumping me completely.
Had another dive through the Dell website for your computer and notice there's an updated driver for your sound card on it, but then there's a more upto date version on the creative website also.
Maybe download those and give them a shot see if they make any difference, I'll keep thinking though.
I pulled out the oldest video card driver I could find and just enjoyed my first crash-free MxO experience in months. Thanks to all who chimed in to help!