Is there a way to make wherever the water is coming from go somewhere else before it gets to the window? Or is it ground water coming up?
Do you have downspouts draining into the weeping tile? Mine had that when I moved in, and occasionally caused water to pour through a foundation crack. Fixing that reduced the issue. Last fall I used the Sikkens foundation crack filler kit, and it's been dry throguh this wet year. I assume your walls are finished, but I wouldn't be surprised if you have a leaky crack.
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