To insert Processor Manufacturer and Model

Open "c:\windows\system\Oeninfo.ini" file with notepad or any test editor. 
Type following in the file: 
_________________________ 
[general] 
Manufacturer= Intel® 
Model= Pentium® 4 
_________________________ 

(To type "®" press 0,1,7,4 one after another while holding alt key) 

Replace Intel® and Pentium® 4 by your Model and Processor 
Save the file. All done! 
Now right click on "My Computer" Icon and left click "Properties" 

(NOTE: It is necessary to backup your original oemlogo.bmp or oeminfo.ini if they exist.)