First of all , go to C:\Windows\Branding\ShellBrd and have a manual copy of shellbrd.dll ; so that you can restore it in future .
The actual tutorial is divided into two parts :
Part : I - Drawing the Logo
Start Photoshop ... open a new document with 157x151 pixels , let the background be transparent at the start .
Now fill the document with black , place your desired image on it ( You may resize it to fit in the place (Edit>Free Transform ; Hold shift and drag mouse ) . When done , Hold control and click on the logo layer to select the logo (layer 2 in example) .
Now click on Channels pallet , four are already there ... RGB , red , green and blue . Click at the new channel button at the bottom of the pallet ; it will add a new channel Alpha1 , and at the same time will make the other channels invisible
Now , with the channles pallet selected , pot the rounded brush tool (size say 100 pixels) , make it sure that the foreground color is white and background color is black , and fill the selected (previously, instep 2) part with white. So now your channels pallet looks like the shot below
Now click on the vacant box in front of RGB channel to make the other four layers visible again , Get back to layers pallet and flatten the image . Save it as 32 bit BMP file on Desktop , and the first part is done .
Part : II - Modifying and Replacing
Start Resource Hacker .... go to C:\Windows\Branding\ShellBrd , and open shellbrd.dll with it .
Expand Bitmap > 1050 > 1033 ; Cilck on Action > Replace Bitmap , and replace the existing with the just made one .
NOTE: (for 125% resolution it will be 2050>1033 and for 150% it will be 3050>1033)
Save the result as shellbrd.dll on desktop .
Open System File Replacer, and replace the original dll with the modded one ( you may do it manually too , and you are to take ownership if the file which is shought to be replaced for this purpose ).
Restart your computer , and you are done . This is the result belowthat I got .