Try these steps to rename entries in the boot menu:
1.Start your computer and choose either entry from the boot menu. After startup completes, make a note of which installation is running.
2.Click the
Start button , type
cmd in the Search box, and press CTRL+SHIFT+ENTER. Click
Continue in the User Account Control box to open an elevated Command Prompt window.
3.Type the following command:
bcdedit /set description "Menu description goes here" (substitute your own description for the placeholder text, and be sure to include the quotation marks). Press ENTER.
4.Restart your computer and note that the menu description you just entered now appears on the menu. Select the other menu option.
5.Repeat steps 2 and 3, again adding a menu description to replace the generic text and distinguish this installation from the other one.