Serial No: chanching 

This short code can be use in emergency
For Device Manger: Run – devmgmt.msc
Creating a custom Microsoft console tools: Run – mmc
System information tool: Run – msinfo32.exe
File signature verification utility: Run – sigverif.exe 
Find computer IP address: Run – cmd – click ok then ipconfig



How do I find my computer manufacturer?
Click Start, click Run, type msinfo32, and then click OK. Your computer manufacturer is listed as the System Manufacturer in the right pane of the System Information window.


Follow the below guidance to change you windows key 
1-	click start
2-	click Run
3-	in the Run type: regedit
4-	Click Ok
5-	In the left pane, locate and then click the following registry key: HKEY_LOCAL_MACHINE
6-	Software
7-	Microsoft
8-	WindowsNT
9-	Current Version
10-	WPAEvents
11-	In the right pan right click  OOBETimer and click Modify change at least one digit of this value to deactivate Windows
12-	Click Start  and then click Run
13-	In the open box type the following command and then click Ok. %systemroot%\system32\oobe\msoobe.exe /a
14-	Click Yes, I want to telephone a customer service representative to activate Windows, and then click next.
15-	Click change product key.
16-	Type the new product key in the new key boxes and then click update.
17-	If you are returned to the previous window, click reminds me later and then restart the computer repeat steps 6 and 7 to verify that windows is activate. You receive the following message: windows is already activate. Click Ok to Exit.
18-	Click Ok
19-	Install windows XP SP1 or a later version of Windows XP.
20-	If you can not restart windows after you install windows XP SP1 or a later version of windows XP press F8 when you restart the computer select last known good 
21-	Configuration and then repeat this procedure.