If you have updated your windows OS to Windows 10, you will
be probably wondering what happened to the previous version of the windows 7/8.
Your old OS won't get deleted/erased. Windows creates a folder as Windows.old
in Windows installation folder. You can
see in the below picture.
If in a month's time after upgrade to windows 10 ,if you want
to revert back to the previous version of windows this will let you to go back
to the previous version. The previous version will be available till one month
from the upgrade to windows 10 .
There are two ways how this can get deleted.
1. Windows will automatically delete the previous version
after one month from the upgrade to Windows 10.
2. If you are in short of the free space in your windows
installation drive you can safely delete previous version following the below
steps.
·
From the cortona search type storage and click enter.
·
Storage window will appear as below
· 
·
Click on the windows installation derive
·
This will show the storage usage as below
· 
·
click on temporary files as shown in the below picture.
· 
·
As show in the below picture , it will show the size of the
previous windows version.
·
If you don't need it ,click delete previous version
· 
·
Within few minutes this will free up the space.
·
Note: If the previous version of windows gets delete, if you
not be able to revert back to previous version. Delete only if you are short of
space.
