The Windows Experience Index measures the capability of your computer’s hardware and software configuration and expresses this measurement as a number called a base score. A higher base score generally means that your computer will perform better and faster than a computer with a lower base score, especially when performing more advanced and resource-intensive tasks.
How this base score is calculated?
Each hardware component receives an individual subscore. Your computer’s base score is determined by the lowest subscore. For example, if the lowest subscore of an individual hardware component is 2.6, then the base score is 2.6. The base score is not an average of the combined subscores. The scores currently range from 1.0 to 7.9
View your computer’s base score
Like Windows Vista, Windows 7 does not runs the Windows Experience Index after the completion of installation process. you have to rate your system at your own. Follow the below steps to rate your Computer.
Open computer properties (press WIN + Pause Break Key or right click on My Computer and select properties).
In properties window, click on “System rating not available” (if you haven’t rated yet) or “Windows Experience Index” (if you have rated your PC already)
Now in the Windows Experience Index window, click on the “Rate this computer” button to run the rating process or click on “Re-run the assessment” if you have already rated your PC.
After running all the assessments, it shows your system rating.
Above is my PC score – 3.5 but we can easily tweak it and can make it show 7.9, lets see how
How To tweak Windows Experience Index
Just follow the below steps as it is to change your WEI score. Below is mine score before applying this hack.
Type Notepad in Start Menu Search > Right-Click > Run as Administrator. Now press CTRL+O to browse and open the file (change the document type to All Files).
Now Navigate to Windows\Performance\WinSAT\DataStore and open ******* Formal.Assessment (Initial).WinSAT file
Now Press CTRL+F to find and type SystemScore and press Enter
Change the Systeem Score to whatever value you want say 7.9 the highest and save it. That’s it
Now open your Computer Properties and see changes
Now go on and tweak your system and if you experience some problem let me know.
looks bit hectic to tweak the score but quite interesting, will try this for sure.
That’s a pretty easy fix. I have a fast machine, but my score is pretty low because of my graphics card is just the built-in motherboard card. One question though, what is the score used for? Does it matter for anything what the score is?
Wow…. this really is a cool trick! Can show off that we have a great PC!
my current index is 4.9…. can put it to 7! 
.-= Pubudu Kodikara´s last blog ..Contest Updated : Win a (BitDefender Internet Security 2010) + (WinX DVD Ripper Platinum) + ($15 in Cash or A Copy of 31 Days to Build a Better Blog) =-.
This is surely not genuine, but great idea !! I can now fool my friends
Really a great trick bro!
Why in the world would anyone want to do that ?
Even IF Windows uses the lowest subscore …… it’s a false reading .
First its not a false reading.
Second, you can use it to show off to your friends
@Author Are you sure this is not false ? It looks like tampering with data to me… But whatever it be, I sure liked it… My friends were shocked that my old PC got such a high score
.-= Siddhu´s last blog ..Space Myths Busted =-.
It’s not tweaking, it’s faking
cool but useless
why it does not runs the Windows Experience Index after the completion of installation process?
Thanks..
Because you have once run Windows Experience, and it has stored the result so next time it just use the result which it had previously generated.
Anyways you can run it again but than your tweaked WEI will be lost
Haha, I can’t believe they pulled the identical stunt as last time by leaving an iPhone 5 somewhere. Surely if you had one thing like that you would not let it out of you sight! even for a minute