Mabinogi Gold

Hello I have an old computer that meets all the RECOMMENDED requirements for Mabinogi

The specs are

 Intel Celeron 2.4 Ghz Processor

Nvidia Geforce FX 5200 pci (latest drivers)

1.25 GB of DDR RAM

60 GB of HDD space

Windows 7 Home Premium (x32 bit) - (freshly installed, but I havent tried it on this yet, when I played Mabinogi it was on Windows XP SP3)

24-bit Sound card (Sound Blaster Audigy HD)

So, why does the game lag with low FPS?  ALL my graphics options are on the lowest possible. Even with the performance setting on, its

still laggy. I can't even walk through Dunbarton. I've been player for years on a newer, better PC but it recently broke so no I will not accept buy a new computer as an answer. Thanks for your help I appreciate it!