Steps to Generate Another ssh key:

1. from cmd prompt go to c:/users/xyz/mkdir .ssh
2. open gitbash from c:/program files/git/bin/bash.exe
3. typessh-keygen -t rsa -C "your-email-address"
4. Enter full path when asked for the file name (this is important)C:/Users/xyz/.ssh/id_rsa_ge
5. Enter pass phrase..and your key shall be generated.
6. Login to your Github account “SSH and GPG keys” click New SSH Key button
7. Open your id_rsa_ge.pub file in a text file eg notepad and copy everything and paste into the key dialog..give any title of your choice.
8. In git bash Typessh-add ~/.ssh/id_rsa_ge
9. If it says “Could not open a connection to your authentication agent.”, do the following commands a. ssh-agent b. $ eval $(ssh-agent)

it should return a agent pid Now again repeat step 8.

Create config file in .ssh folder and type

#Default GitHub
Host github.com
HostName github.com
User git
IdentityFile ~/.ssh/id_rsa

Host github-ge
HostName github.com
User git
IdentityFile ~/.ssh/id_rsa_ge

Now use git

git add .
git commit ...
git push origin master

Note: before reinstalling your OS always take a backup of keys