I am running Vista and have found the solution. Here is where I found it.... http://www.dosbox.com/wiki/FAQ Q. My backslash key is mapped to ']' with DOSBox in Vista. Is there a workaround? A. Press CTRL-F1 to enter the keymapper and select the backslash with your mouse. Press the DELETE button that …

I am having this same problem and I have a basic desktop keyboard. I have tried everything you have suggested to no avail. If anyone can help, it would be very appriciated.