how about:
if(f1 == 1){
memcpy((LPVOID)0x37465B30, "\x90\x90\x90", 3);
memcpy((LPVOID)0x37235089, "\x90\x90\x90", 3);
memcpy((LPVOID)0x37465B44, "\x90\x90\x90", 3);
memcpy((LPVOID)0x37465B47, "\x90\x90\x90", 3);
memcpy((LPVOID)0x37465B50, "\x90\x90\x90", 3);
}
if(f1 == 0){
memcpy((LPVOID)0x37465B30, "\xD8\x66\x54", 3);
memcpy((LPVOID)0x37235089, "\xD8\x46\x54", 3);
memcpy((LPVOID)0x37465B47, "\xD9\x46\x48", 3);
memcpy((LPVOID)0x37465B44, "\xD9\x5E\x54", 3);
memcpy((LPVOID)0x37465B50, "\xD9\x5E\x48", 3);
}