Out of memory in module quartus_fit.exe

Basically, you do not have enough memory. IIRC, you need a minumum of 3GB phyisical memory (available) to compile stratix 5 properly. If you have a 32 bit system, then you actually only have 3GB Max available to windows becuase of system overheads. There is a boot setting somewhere that increases the 2GB cap per process of physical memory, but I cannot recall where that is.