First of all, can you remember what you deleted? You can use the savemiifrii method, which only requires a gamecube controller:
1) Plug your gamecube controller into port 4, & while turning on your wii, press down on all directions on the directional pad. The numbers "4.2" should appear at the bottom right corner of the screen.
2) Insert a game disc & it should boot, depending if you have a modchip configured to autoboot or cIOSCORP installed.
Try it, if you can't boot games, you'd need to configure your modchip to autoboot. Are any of your IOS trucha-patched?