yeah. notepad initialy couldn't open files larger than 64KB. So they hacked it so that you can open bigger files, but the hack doesn't work very well in all the circumstances.
this is relevant to the PAE i mentioned earlier and you correctly said that you only heard bad things about it. That is why linux, which doesn't use the PAE, is stable while windows isn't.
so if notepad wants to access more than 64K in windows XP the PAE doesn't work very well in OCed systems, because the tight timings that the hack requires frustrate the MMU of your CPU.
and you bsod.
please don't ban me