(1) Right click on my computer system properties 

(2)its look like this

(3)HERE is your 

     system Information intle(R) cpu 3.80Ghs

(4) Now Download this file 

(5) Now open it. change the test if you want.and 

      then click on File and save it

(6)  after that copy the OEMINFO File and past  

      it c:\windows\system32 Folder

(7) Now chack agian system properties 

Now its changed