Easy way :
1- Close Visual Studio
2- Open Run (Win+R) and paste one by one the following and delete anything inside:
    %localappdata%\Microsoft\Team Foundation\6.0\Cache\
    %localappdata%\Microsoft\VisualStudio
    %localappdata%\Microsoft\VSCommon
3- Restart your VM
4- Open visual studio and configure with new account
Painful way:
1- Close Visual Studio
2- Open Run (Win+R) and paste one by one the following and delete anything inside:
    %localappdata%\Microsoft\Team Foundation\6.0\Cache\
    %localappdata%\Microsoft\VisualStudio
    %localappdata%\Microsoft\VSCommon
3- Open command and run following commands:
- Goto IDE folder where the workspace program exist
Cd C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE - Check all the current workspaces
tf workspaces /server:https://dev.azure.com/{org} /computer:{ComputerName} /owner:* /format:detailed - If you see any ghost workspace delete it
tf workspace /delete /server:https://https://dev.azure.com/{org} '{WorkspaceName};{UserName}
if above command give error run it with user id instead of username
tf workspace /delete /server:https://https://dev.azure.com/{org} '{WorkspaceName};{UserId} 
- Run this command to sure it's deleted
tf workspaces /server:https://dev.azure.com/{org} /computer:{ComputerName} /owner:* /format:detailed 
4- Restart your VM
5- Open visual studio and configure with new account
		
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