In order to fix the issue, I recommend downloading and installing a Spanish keyboard from Software Informer database. Alternatively, you can use some key combinations to type the characters you want:
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á = Alt + 0225
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é = Alt + 0233
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í = Alt + 0237
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ó = Alt + 0243
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ú = Alt + 0250
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ñ = Alt + 0241
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ü = Alt + 0252
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¡ = Alt + 0161
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¿ = Alt + 0191
You need to press the Alt key and to type using the numeric keypad from the right side of your keyboard above the numbers.