There's a big round red cross at the top left of the window . then it says "windows cannot access the specified device , path or file . You may not have the appropriate permissions to access the file . " That's what it says when I try to install ccleaner . I have been having a lot of trouble running some software . I used bing to try and find an answer that's the site I was on . it told me about Hi, If any of the suggestions do not work for you, do the following: 1. right click the application in question 2. at the bottom of the properties screen (under the Advanced button) there is a button that says "UNBLOCK" (there should be a security message that states that this file has been copied from another computer...) 3. Press this button. this worked for me. which did nothing for me , then further down the page the method I tried was . This problem usually on the computers .Now try this. My Computer--->right click on C drive--->properties--->in the upper tab there is security tab click on that After doing this,In security tab there is Groups& Users ---> administrator ----> Permissions ....Give full acess to administrator means that check all the allow except of special permission.... When I right clicked on the C drive I think I must have deleted the administrators that were on there at first , now I would like to start again and put the right . i'm not to teckie minded so you will have to give exact details , my windows is windows 10 64bit , thank you for any help . There was a link I had to take out , that's why I couldn't say what site I was on . sorry I really am quite numb .