How to Fix Internal Errors 2501, 2502 or 2503 While Installing from .msi files in Windows

In Windows 8, you can see an error 2501, 2502 or 2503 when you try to install any application program or game from some .msi (Microsoft Installer) files. You can see the same error when you try uninstall some applications or games. The error message is like the one shown below:

Internal error 2502

TTL IC PinOuts

I am adding TTL (Transistor -  Transistor Logic) IC PinOut diagrams for the ICs 7400, 7402, 7404, 7408, 7410, 7411, 7414, 7420, 7421, 7432, 7442, 7446, 7447, 7473, 7474, 7476, 7483, 7485, 7486, 7490, 7492, 7493, 7495, 74121, 74123, 74138, 74139, 74150, 74151, 74153, 74154, 74155, 74157, 74160, 74162, 74161, 74163, 74190, 74191, 74192, 74193, 74194, 74195, 7488 and 7489. This may be useful for electronics lab for engineering or poly diploma courses. I am adding it as photos here. To download it as pdf, click here.