"Trucha bug restorer" is a piece of software to patch IOS. If you don't that, or what IOS patching is, you should definitely
not be using the software. It is dangerous software and you can mess things up with anything that involves IOS patching; without knowing what you're doing you are much more likely to do so.
WAD installers are not necessary for anything other than piracy (and I suppose some custom channels, but they won't fix anything that isn't working).
I fail to see how watching Netflix could in anyway lead to games stopping working, unless you already had a bunch of silly invasive patched IOS etc. and your friend somehow messed with them. Without knowing what has happened, it's very hard to help you.
My advice would probably be to do an official, online update. This should restore your Wii to working order. This should be safe, but there is a chance if you have messed with patching IOS and/or downgrades and/or region changing etc., something could go wrong. If you have BootMii/boot2, make a NAND dump and then do the update and see if it works.
If you don't have BootMii/boot2, you could still try an update, but I cannot guarantee it will fix your Wii, or even that your Wii will definitely work afterwards (although it is very unlikely an update would stop it working).
I apologise for accusing you of trying to play backups, it wasn't completely clear and I just wanted to make sure before I tried to help you, as any advice I give would be no use for getting backups to run, meaning it would be a waste of both of our time.