Install Windows 7
Start Run C:\Windows\System32\sysprep\sysprep.exe
Choose Enter System Audit Mode
Click Generalize
Choose Reboot
Click Ok
Remove Local User Profile
To remove the temporary user account’s profile
Click Start, type user profile in the Search box, and then click Configure advanced user profile properties in the search results.
In the User Profiles dialog box, click the name of the temporary user account you created when you installed Windows 7 on the reference computer, and then click Delete. Click Yes to confirm.
Click OK to close the User Profiles dialog box.
Delete Local User Accounts
Open Sysprep. (Windows 7 automatically runs Sysprep when you start the operating system in Audit mode.)
In the System Cleanup Action list, select Enter System Out-of-Box Experience (OOBE).
Select the Generalize check box.
In the Shutdown Options list, select Shutdown.
Click OK