LoL won't even open

Before, I tried making a game, and every mode, every selection had a red triangle with an exclamation mark. Now, the window opens in the left-hand top corner, and it's just a black window. Ironically, I bought RP and then got Soulstealer Vladimir from "my shop" with no problems at all, earlier when I couldn't make any games (custom, practice tool, blind pick, etc.)
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