Your 3.4 Wii is very much like 4.0 when it comes to installing wads.
The error you got, 2011 is very common and it is answered on here mostly every day.
What you need to do is get a Custom IOS on your Wii so that you can further install other things.
We have a special very easy method to get this done http://www.wiihacks.com/other-faq-gu...s-any-wii.html
I don't wish to confuse but you are following an older tutorial as you are attempting to install an older version of cIOS36 ver 10, the latest version is cIOS 38Rev13b which is used for USB Loaders, you might like to find and install that once you have it all working.
There also exists cIOS installers for these, with which you can use network installs rather than worrying if you have the right wad file.