Are you able to boot to both the Windows installation entry?
You can delete the old Operating System entry using system configuration utility. To do this, follow the steps mentioned below:
a)Click
the Start button and type MSCONFIG in the search bar and hit Enter
b)Click
continue if prompted for confirmation
c)In
the System Configuration Utility go to the Boot Tab, you should see two Operating systems listed
d)Select
the Operating System entry (Old installation) you want to delete and click the option “Delete”
e)Click
on Apply and Ok
f)Reboot
your computer and verify the change
Very Important: Ensure that you remove the old Windows installation and do not remove the Windows installation entry that is working
fine and set as default.
Microsoft Answers Support Engineer
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