need serious help!

[talems]

Please help correct this sentence to be in the past tense. I know computers, but not US English grammar. I am willing to trade if you need computer help. : ) Thank you.

If we would have stopped the file copy or waited until the copy completed, the server would not crashed.

[engee30]

Please help correct this sentence to be in the past tense. I know computers, but not US English grammar. I am willing to trade if you need computer help. : ) Thank you.

If we would have stopped the file copy or waited until the copy completed, the server would not crashed.

If we had stopped the file copy or waited until the copy was completed, the server would not have crashed.
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NOTE:
Bear in mind I'm not a teacher!