You can attempt to access the file by following the below steps:
a. Locate the file or folder on which you want to take ownership in windows explorer.
b. Right click on file or folder and select “Properties” from Context Menu.
c. Click on Security tab.
d. Click on “Advance”.
e. Now click on Owner tab in Advance Security Settings for User windows.
f. Click on Edit Button and select user from given Change Owner to list if user or group is not in given list then, click on other users or groups. Enter name of user/group and click ok. You can even click on administrator here, if you are logged in as an administrator.
g. Now select User/group and click apply and ok. (Check “Replace owner on sub containers and objects” if you have files and folder within selected folder)
h. Click ok when Windows Security Prompt is displayed.
i. Now Owner name must have changed.
j. Now click Ok to exist from Properties windows.
k. Once you have taken the ownership of file or folder.
Grant Permissions to everyone (or your user account) -
a. Go to C: and then click right click on folder and choose properties.
b. Then go to security tab and click Edit then click Add => Advanced.
c. If you click on advanced now click on Find Now and choose everyone and click Ok.
d. Then again click Ok and now click on Allow => Full control => Ok.