Please follow this:
Hold down Windows(flag key and) and press letter R.
You will get a box at bottom left hand side.
type Regedit and press 'Enter key'.
b. In the 'Registry Editor' window, Browse through the location(HKEY_LOCAL_MACHINE32\Software\Classes\rss\shellex\(8895B1C6-B41F-4C1C-A562-0D564250836F)
) as given in the error message. Right-click the entry which you want to change, and choose 'Permissions'
c. The 'Permissions for <registry key name>' dialog is displayed.
From here you can
d. Select users and change their permissions.
e. Click 'Advanced' to open the 'Access Control Settings for <registry key name>' dialog box, and change users access control.
f. When you have completed your changes, click 'Apply' and 'OK' to accept them.
Restart your computer and let me know the results, please.