Paul Thurott discovered a way to perform a clean install of Windows 7 using Windows 7 Upgrade media and to activate it with just a simple tweak which can be applied in the running operating system.

According to Paul all that needs to be done after performing the initial clean installation of Windows 7 is the following:

After performing the clean install, ensure that there are no Windows Updates pending that would require a system reboot. (You’ll see an orange shield icon next to Shutdown in the Start Menu if this is the case).

Then, open regedit.exe with Start Menu Search and navigate to:

HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Setup/OOBE/

Change MediaBootInstall from “1″ to “0″.

Open the Start Menu again and type cmd to display a shortcut to the Command Line utility. Right-click this shortcut and choose “Run as administrator.” Handle the UAC prompt.

In the command line window, type: slmgr /rearm

Then tap ENTER, close the command line window and reboot. When Windows 7 reboots, run the Activate Windows utility, type in your product key and activate windows. It should just work.

There you have it. An easy way to do a clean install of Windows 7 using an upgrade DVD. This is obviously only legal if you own a previous Microsoft operating system that’s supported by the Windows 7 Update program.

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It might be easier to sometimes enter a specific command directly instead of the shell: substitute if a command for that specific function or folder exists. Make sure that there are no spaces in the command unless the name of the folder or app that should be opened contains one or multiple.

Here is a list of all possible shell: commands that should work in the mentioned operating systems:

AddNewProgramsFolder
Administrative Tools
AppData
AppUpdatesFolder
Cache
CD Burning
ChangeRemoveProgramsFolder
Common Administrative Tools
Common AppData
Common Desktop
Common Documents
Common Programs
Common Start Menu
Common Startup
Common Templates
CommonDownloads
CommonMusic
CommonPictures
CommonVideo
ConflictFolder
ConnectionsFolder
Contacts
ControlPanelFolder
Cookies
CredentialManager
CryptoKeys
CSCFolder
Default Gadgets
Desktop
Downloads
DpapiKeys
Favorites
Fonts
Gadgets
Games
GameTasks
History
InternetFolder
Links
Local AppData
LocalAppDataLow
LocalizedResourcesDir
MAPIFolder
My Music
My Pictures
My Video
MyComputerFolder
NetHood
NetworkPlacesFolder
OEM Links
Original Images
Personal
PhotoAlbums
Playlists
PrintersFolder
PrintHood
Profile
ProgramFiles
ProgramFilesCommon
ProgramFilesCommonX86
ProgramFilesX86
Programs
Public
PublicGameTasks
Quick Launch
Recent
RecycleBinFolder
ResourceDir
SampleMusic
SamplePictures
SamplePlaylists
SampleVideos
SavedGames
Searches
SendTo
Start Menu
Startup
SyncCenterFolder
SyncResultsFolder
SyncSetupFolder
System
SystemCertificates
SystemX86
Templates
TreePropertiesFolder
UserProfiles
UsersFilesFolder
Windows

Are there commands missing? Let us know.

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You might want to check out our article about Windows 7 which has all the information you need to download the beta of the new Microsoft operating system. If you are not convinced yet that this is a good idea read on; You might be surprised:

1. Opening multiple Instances of the same program

Want to open multiple instances of the same program? Maybe a second command prompt or another application that can be opened in multiple instances? Instead of opening the program again the usual way you can simply press the SHIFT key and left-click on the first instance in the Windows Taskbar to open a second one.

2. Problem Steps Recorder

If you ever had to do phone support you know how hard it can be to understand what the user on the other end of the phone did and wants. The Problem Steps Recorder is a sweet little tool in Windows 7 that can be used by the user to record his steps.

All that the user needs to do is start the recorder by entering psr in the Start Menu box and click on Start Record in the program interface. Screenshots will be taken from user actions. It is possible to add comments at any time if the user feels so. The whole recording will be saved as a zip file containing a slideshow of the actions.

3. Pin Favorite Folders

Want to add a favorite folders to Windows Explorer to be able to access them faster? Just drag and drop the folder to the favorites menu. It will remain there until you delete it with the delete key again.

4. Moving Windows and such

Windows 7 introduces several new keyboard shortcuts for window management. Some useful ones are:

• [Windows Shift Left Arrow] or [Windows Shift Right Arrow] to move windows from one computer monitor to another.
• [Windows Left Arrow] or [Windows Right Arrow] to dock windows to the left or right side
• [Windows Up Arrow] to maximize a window
• [Windows Down Arrow] to restore or minimize windows
• [Windows Home] to minimize all windows but the active one

5. Shortcuts to start pinned taskbar items

Pressing [Win Number] will start a new instance of a pinned taskbar item. You should also note that the items can be dragged and dropped into different positions easily.

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