Check out the pre-application screen on the on-screen emulator: ・・・・
It's still hard to see: ！！！！
So, I checked again and succeeded.
https://ideacloud.co.jp/dev/windows_android_studio_debug.html
I'm so glad that even an "old lady" can understand what you're saying!
In one case, the location of the folder was slightly different.
This PC is Windows 7 64bit and the actual device is Nexus7.
The "android_winusb" was found in C:\Users\Username\AppData\Local\Android\sdk\extras\google\usb_driver
I didn't know that you can find the address of the folder by clicking on the folder symbol on the WWW.
。。。。 As I was writing this, it was not recognized again.
Lost and found again: ・・・・・/(^o^)backslash
(CONTINUED)
http://www.upload-gp.co.jp/blog/android/2013/02/nexus7.htmlAnd step 5 and below is perfect! (Old)
We also recommend reviewing the settings on the actual machine.
Phew! I'll have some tea.
English 
Japanese