|The wireless password is a property of your wireless router so it should be obvious that it will not be printed anywhere on your Kindle HD.|
Look underneath or at the back of your router for item called "Wireless key" or log in to the router's configuration utility using a wired network connection. The wireless key will be shown in the wireless section of the router's config utility.
OtheHill - the OP's problem has nothing to do with Windows.
He/She is trying to establish a wireless connection on his Kindle HD which runs Android, not Windows.