How to Upgrade Windows 7 RC Ultimate to RTM Enterprise

Upgrading Windows 7 RC Ultimate to RTM Enterprise is not easy , and some people think that it is not supported technically. But Gustavo Tandeciarz has published a very easy method to update your windows to RTM enterprise. To proceed for this, back up all your data and you should have both the windows of  same kernel (either 32bit or 64bit). To upgrade windows 7 RC Ultimate to Windows RTM Enterprise, follow these simple steps as described by Gustavo Tandeciarz:

1. Open up the Registry Editor (Start > Run > regedit) Go to HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\Current Version as seen in the screenshot below
2. 
3. Replace the word “Ultimate” with “Enterprise” in ProductName and EditionID.  You’re done modifying Windows 7 RC.

Now comes the (kind of) tricky part.

1. Take the Windows 7 Enterprise DVD and create an ISO image.  You will need to open the ISO and modify a file, more specifically, cversion.ini.
2. Once you have the ISO image, using an ISO image editor (I used PowerISO), and browse the DVD image.  Locate \sources\cversion.ini and extract it to your desktop, then open it with notepad.
3. Change the winclient value to 7100, save and close.(winclient=7100)
4. Replace the file in the ISO with the file you just edited and burn the ISO to a DVD.
5. Start the installer from within Windows.
6. Be cooler than the next guy.

That’s it.  Enjoy what is, arguably, the best version of Windows yet.

[via Gmtaz.com]