After you have installed your Visual Studio 2010 Express product, select Register Product from the Help menu.
A Registration Key dialog box appears. Click on the Obtain a registration key online button, and go through the Registration process (using your Windows Live ID account).
After you complete the online registration, a Product Registration Key popup window will appear. To copy the registration key, highlight the key, and press Ctrl + C or right-click the mouse button and click Copy.
4 . Paste the key from the clipboard to the Registration Key field (press Ctrl + V or right-click the mouse button and click Paste).
Comments
I found this;
http://web.archive.org/web/20101230204403/http://www.microsoft.com/express/support/regins/
After you have installed your Visual Studio 2010 Express product, select Register Product from the Help menu.
A Registration Key dialog box appears. Click on the Obtain a registration key online button, and go through the Registration process (using your Windows Live ID account).
After you complete the online registration, a Product Registration Key popup window will appear. To copy the registration key, highlight the key, and press Ctrl + C or right-click the mouse button and click Copy.
4 . Paste the key from the clipboard to the Registration Key field (press Ctrl + V or right-click the mouse button and click Paste).
Joe
Found this at https://social.msdn.microsoft.com/Forums/en-US/43e9d22d-6df7-47a0-ac2f-29c5f7478356/visual-basic-express-2010-registration?forum=Vsexpressvb
2KQT8-HV27P-GTTV9-2WBVV-M7X96
Joe