Change your theme at your own risk

Just wanted to drop a quick note here to clarify that if you choose to follow my instructions to change your Windows XP theme, you do so at your own risk! ;) Today my anti-virus program crashed (well, it refused to turn on, I consider that crashing). I don't know if it's just coincidence or that some system files got corrupted when I mucked around with the theme and the other programs...but whatever it is, just be careful! :P