Full error as displayed in lower left corner of bitcoin-qt GUI:
Db::put: Not enough space
C:\Program Files (x86)\Bitcoin\bitcoin-qt.exe in ProcessMessages()
EDIT: Checking "detach database at shutdown" does nothing, also can't seem to shut it down properly. Results in a ghost icon in the task bar which doesn't respond to clicks and can only be manually rid of via Task Manager.
EDIT2: Mods can go ahead and delete the thread. I'll re-post it in Tech Support, I panicked and posted here without thinking.