Haven't played this in a couple of months. Mainly due to frequent crashes being kind of frustrating.
Since then, I've:
Got a new motherboard
Doubled my RAM (4gb)
Completely reinstalled Windows XP
New graphics card
Unity Web Player is up to date. Firefox is up to date. Game runs horribly sluggish and Unity Web Player crashes every few minutes. Kills my browser completely. Sometimes on the login screen, sometimes while loading the first dungeon run, sometimes the second. Pretty much exactly the same as it was when I quit playing it months ago.
I can't even comprehend how this is possible. At least you fixed the full screen cursor issues