Help Wind Waker Crashes

[kironrda]

Hello i've been playing zelda wind waker and it has ran flawlessly thus far until i got to the part after i kill the first boss. I kill him and i picked up my heart piece but when i step into the portal in the center my screen turns solid gray and i havn't been able to find anyway to get past this part. plz help

Windows Vista
Amd Athlon 64 X2 duel Core 6000+ 3.00Ghz
3gb of ram
Nvidia Geforce 8600 GT