I've tried opening it with uTorrent and 7zip.
I'm taking that to mean you've downloaded it through ddl and though a torrent, otherwise I'd have to ask what the hell you were doing in the first place.
1. It's a rar file. Open the rar with 7zip and extract the contents somewhere.
2. Inside is the scr file. You right-click this and hit Install.
2b. If this option isn't available, right-click and view Properties, go to the General tab and see if you have to Unblock the file. Try again.
2c. Copy it to C:\Windows\System32 and/or SysWOW64. Now it shows up in your screensaver options.
3. If an error appears, screenshot and post it. Otherwise, just explain why these steps didn't work.