First empty the C:\WINDOWS\Prefetch folder to get rid of that error.
And just open "my computer" and in the top you'll see a "tools" button , after you click on that you'll see the folder options.
Try this and then see if you can download Ewido:
Download the Hoster from
here. Press "Restore Original Hosts" and press "OK". Exit Program. This will restore the original deleted Hosts file.