How to solve GIT permission denied

I've encountered this GIT permission denied several times before each time I always come up with a different solution. This time from a friend of mine:

Copy your private and public keys from c:\users\yourAccount\.ssh to where you install git. Normally c:\progra~2\git\.ssh

You will encounter this problem when:
1.) Clone/Checking out in github
2.) Clone/Checking out in assembla
3.) Clone/Checking out in openshift

Another source of this problem is when you forgot to upload your public key in your online repo settings.