I Discovered this loophole when i needed files off of a computer after the activation period expired when the computer didnt have a valid serial.
**THIS ISNT TO PROMOTE PIRATING,THIS IS MERELY FOR PROOF OF CONCEPT AND TO RECOVER FILES**
1.Click yes to the 'you have to activate windows to log on' box
2.Tick the 'activate windows over the internet' box,and then press next
3.Tick the 'no i dont wish to register' box and then click next
4.Now find the link that goes to the 'Microsoft Activation Assistance Web site" (It will be underlined).Now click on this,and internet explorer will appear.
5.Now up in the Adress bar,type in "my computer".My computer will now appear! From here you can gather up all the data you need.
If you need to display your desktop and your start menu,when you are at my computer,click on the drive where windows installed,click on the windows directory,and then find "explorer.exe" and then double click on it,it might dissapear,so double click on it again.
the Activation box might close it after a while so be quick.
**KEEP THE ACTIVATION WINDOWS OPEN,OTHERWISE YOU WILL BE LOGGED OUT**