help losing memory!

Do you mean harddisk space? If yes, try decreasing the swap-file (I'll explain how if you could say which windows you are using).

Uhh, PJ64 loads the rom into memory and has ALOT of information to keep in memory, depending on the Rom Size the larger the memory consumption...

yep, up to 64MB ROM + 8MB RDRAM + 50MB compiler buffer + other core functions + all the plugins (especially the video plugin caching) - 100-200 sounds about normal. it's high but it's not going to do any harm to your computer.. is your PC actually crashing?

i would *not* recommend decreasing swapfile size.