Okay, this is what happened first off.
Before tinkering, it worked fine, until I entered a server, (Any server), where it worked for <2 seconds, and immediately crashed to desktop, with a mere "Has stopped responding" styled response to the crash.
Replaced RGL files, didn't work, reinstalled, didn't work, uninstalled persistant world mod (considering Native was working fine before, and the only difference was installing the PW mod) didn't work, deleted the char used yesterday on the PW, just in case, still didn't make a difference.
Muiv suggested taking a look at video drivers, which I will do after one last reinstall.