help cygwin

hi, i'm working to my thesis on Windows and i'm using g++. When i execute the program ( it calls the malloc function) it give me an STATUS_ACCESS_VIOLATION i have read that g++ gives the errors like this one and to solve it i have to use mmalloc but there is no change. Help me!! I need either another function or another compiler (where can i find it?? now I'm using g++ from cygwin-b20) I post the dunping stack trace: [main] parse 1000 (0) exception: trapped! [main] parse 1000 (0) exception: code 0xC0000005 at 0x404647 [main] parse 1000 (0) exception: ax 0xA03A780 bx 0x5 cx 0x1 dx 0x0 [main] parse 1000 (1) exception: si 0x0 di 0xC66CC490 bp 0x245FEE8 sp 0x245FED8 [main] parse 1000 (0) exception: exception is: STATUS_ACCESS_VIOLATION [main] parse 1000 (0) stack: Stack trace: [main] parse 1000 (0) stack: frame 0: sp = 0x245FAC8, pc = 0x6100A2C3 [main] parse 1000 (0) stack: frame 1: sp = 0x245FB04, pc = 0x7C9137BF [main] parse 1000 (0) stack: frame 2: sp = 0x245FB28, pc = 0x7C91378B [main] parse 1000 (0) stack: frame 3: sp = 0x245FBD8, pc = 0x7C91EAFA [main] parse 1000 (0) stack: frame 4: sp = 0x245FEE8, pc = 0x404663 [main] parse 1000 (0) stack: frame 5: sp = 0x245FF08, pc = 0x403E64 [main] parse 1000 (0) stack: frame 6: sp = 0x245FF2C, pc = 0x402C68 [main] parse 1000 (0) stack: frame 7: sp = 0x245FF34, pc = 0x61004402 [main] parse 1000 (0) stack: frame 8: sp = 0x245FF88, pc = 0x61004420 [main] parse 1000 (0) stack: frame 9: sp = 0x245FF94, pc = 0x40623E [main] parse 1000 (0) stack: frame 10: sp = 0x245FFA4, pc = 0x40103A [main] parse 1000 (0) stack: frame 11: sp = 0x245FFC0, pc = 0x7C816D4F [main] parse 1000 (0) stack: frame 12: sp = 0x245FFF0, pc = 0x0 [main] parse 1000 (0) stack: End of stack trace