If they still don’t detect each other, make sure they are both using the same default gateway (just in case you have some stray wireless router handing out IP addresses or something). You can check that by using Start > Run > cmd, then typing “ipconfig” in the window that comes up and hitting enter.
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When I go to run and type in ipconfig a square black screen pops up for just an instant. it does this on both computers.
Type “cmd” in the run box.
Then, in the black box that comes up, type “ipconfig” and hit enter. If you just type ipconfig in the run box, without doing cmd first, it will run but exit immediately, so you can’t see the results (unless you are really quick with that pause button on the keyboard).