Using W32Dasm, and HIEW. 
OK, let’s start:
First of all, you have to run the damn game you want to crack, without the CD.
The game, doesn’t work of course, (Please, don’t panic) BUT a window pops up, telling you an error message. 
This error message will help you to crack the game so, you’ve got to remember it.
For example: Please insert the - CD, or: You need the CD to play the - . 
(  -, is the game you want to crack). Anyway, if you are so idiot and you  can’t remember it, write it, in a little piece of paper.
Now, run  Win32Dasm, and on the toolbar, press the first little button on the  left, OR, go to Disassembler ->Open file to Disassemble. A menu will  pop up. Select the exe which you want to crack. The disassemble, will  take few minutes so, I suggest you, to go for shitting. 
OK, it finished its process. 
Now,  in your screen, there is a strange text, and we can’t understand  anything of course. Don’t worry, the only thing we have to do, ( If you  want, you can change the font), is to click on the String Data  References, the button next to the print button (Strn.REF). 
You  can see a window which is called String Data Items. Scroll down, and  try to find the game’s error message. When you’ll find it, double click  on it, and then, close the window, to go back to the Win32Dasm text. 
As  you can see you are somewhere in the CD check routine. This is the  message’s place. Now comes the interesting and difficult part, so, be  careful. 
We don’t know what all these shits mean, BUT we must know the @ offset of every call and jump command.
Write  down, every call and jump @ offset number. (You have to be sure, that  the OPBAR change its used color to green). You need the number behind  the @offset without the h. Let’s go to HIEW, now.
HIEW:
To move up and down, use the cursor keys. Start HIEW. exe. 
In  the HIEW directory, there is a list of exes and programs. Go to the  directory, which you saved the game’s exe, we want to crack, and click  on the exe. Click F4, and then, a menu will pop up, with 3 words. Text,  Hex, and Decode. Click on Decode, and now, we can understand the list of  numbers.
Click F5, and you can now enter the number, we wrote down,  in Win32Dasm. Type it, and you will be placed at the number’s place. The  cursor is placed on a command. 
Before  I’ll continue, I want to explain you something. For example, if the  command where our cursor is placed on, is E92BF9BF74, means that it is 5  bytes.
Every 2 numbers, are one byte: E9-2B-F9-BF-74 = 90-90-90-90-90. 10 letters, mean, 5 bytes. 
OK, if you understood it, you can continue. 
Press F3, which means edit, and now you can edit these ten numbers.
Type five times, the number 90. For every byte, 90. Now click on F10 to exit.
We cracked the CD protection
 
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