Format, blue screen, click click your HDD is dead, kaboom! pc explosion

and after that you realize that your whole effort of kills, headshots, bootcamps, hundreds of hours
simply...gone.
You start the game and you see:
Welcome new user! and your face looks like -->

Thankfully, these days are over.
Lets get started.
Note: This guide works on both original and cracked copies.
Preparation before the disaster:
1) We need to save your profile so you're gonna need an external drive, USB or Dropbox which I HIGHLY recommend (online data store)
2) Go to My Computer --> Program Files --> Activision --> Call of Duty 4 - Modern Warfare --> players --> profiles
3) Save to one (or all) storage solution that I recommend on step 1.
4) Load Call of Duty 4
5) Go to Options --> Multiplayer Options --> and press ''Enter key code''
it should reveal your serial number.
6) Write down the numbers and letters (this step is important!)
7) Save it on notepad and store it with your profile folder as I said on step 3.
*Next step is optional, you can download it after the disaster*
8) Download the two patches for MP:
CoD4MW-1.6-Patch http://www.gamershell.com/download_27186.shtml
CoD4MW-1.6-1.7-Patch http://www.gamershell.com/download_28304.shtml
Thats all you need!

Now lets put them all back to be able to play with your old and sooo precious profile.
1) While installing the game it'll ask you for the serial number,
use the one and only that you saved before.
If you lost it then the whole thing is a second disaster you fool!
2) Do whatever you need to do after (replace cracked .exe etc..)
3) Install the two patches to be able to play MP with the latest maps, fixed bugs blah blah
4) Start the game and when prompt to enter your name as a new player enter your old name you used before the disaster
5) Play for a few minutes *to create a profile on saves*
6) Close the game
7) Go to My Computer --> Program Files --> Activision --> Call of Duty 4 - Modern Warfare --> players --> profiles
8) Delete the profile folder and replace it with your old one
9) Done!
Enjoy!
A few notes:
- I saved my profile, serial number and patches on another internal HDD and on Dropbox (to have it wherever I go)
so I recommend to do the same.
- If for any reason you lost the profile and serial number, of course there is no other way to play with your own set up (guns, kills, completed ranks and so on).
But there is one last solution to play MP with Rank 55 and use all the guns,
you can download a package called CoD 4 Rank Tool: http://solariz.de/937/cod4-rank-55-mpdata-patcher.htm
It's NOT a cheat tool !!
As the creator said:
''My intention behind this isn't actually cheating.
The Problem was my crashed Windows & reinstall with the conclusion of beginning from scratch.
If you are used to play at lvl55 it is hard to start from scratch.''
This is a last time solution.
Thank you..!

I'd be happy to help you with any questions.
sistah