copying cmd.exe is bad practice cuz you don't want versions littering your hdd,
and copying apk to tools is bad practice cuz you don't want "personal data" mingled with installs. I got mine working with the following steps:
1. install all the stuffs per stock instructions (SDK, USB driver, etc...)
2. add tools dir to path:
3. go to path where apk lives (hopefully under your docs or downloads).
4. C:\users\[myusername]\eclipse\HelloWorld\bin>adb install Your.apk