I assume that your 5" Chinese GPS runs windows-ce. In windows-ce, there are many ways to load a program at start-up. One way is to add a shortcut of your program to the \windows\StartUp folder. If you have CECMD (Total Commander) on your device, make a shortcut of igo.exe and copy it to the \windows\StartUp folder. Then soft-reset your device and igo should be loaded automatically. However, when you hard-reset, you have to copy the shortcut once again.
Then use the built-in windows explorer. Go to the folder where you have igo.exe and highlight it (click on it). Then, click on Edit - copy. Go to the windows\StartUp folder, click Edit - paste shortcut.
Close windows explorer and soft-reset your device.