My computer will not let me download anything. It says the security will not let it, (do not understand) did not change anything in settings, and was downloading things before help

For recent Internet Explorer versions the setting is in Tools > Internet Options > Security Tab > Downloads Group > File Downloads: Enable/Disable. What browser are you using, what is the message, and what application is generating the message? Security suites can also impact capabilities when browsing.

Are you listed as admin in the PC? If not go to control panel/users/,and set yourself as with admin rights. Otherwise,your firewall/antivirus is blocking the downloads.

Every time I try to down load I get this message (C:\Windows\TEMP could not be saved, because you cannot change the contents of that folder.

Change the folder properties and try again, or try saving in a different location.)