If your wii is that old, I would recommend following the 3.1-4.1 guide to get everything up to date. You should also be able to install bootmii as boot2 which can save you from 99.9% of most bricks if you make a nad backup. And seeing as how this is your first post...
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It is NOT advised that you update to system menu 4.2 at the moment. Although it can still be modded, it's only reason for existing was to eliminate the homebrew channel.
If you have not softmodded yet, there's an excellent guide by dogeggs for system menu 3.1-4.1 FOUND HERE
And a wonderful guide by messie for system menu 4.2 FOUND HERE
Any other problems can usually easily be found by searching.
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