Once again, all we DO know is that the guy wants help finding out from her computer. And once again, I know from having been in those shoes, that once you reach that point, you're past talking, because it's pretty much over.
Believe me, if I wasn't sure my ex was cheating on me, I would have simply sat down and asked what was going on. But that's not how it was playing out - I knew that something was happening, I just needed the specifics of what was happening.
But the OP didn't say that he KNOWS his wife is cheating, just that he is suspicious.