TFPT not working with VS2015 - visual-studio

Question

I am using Visual Studio 2015 and Team Foundation Power Tools 2015 and the explorer extension and the command line tool is not working. When i type tfpt in Devleoper Command Prompt for VS2015, i get the following error.
Unhandled Exception: System.IO.FileNotFoundException: Could not load file or
assembly 'Microsoft.TeamFoundation.Common, Version=12.0.0.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its
dependencies. The system cannot find the file specified. at
Microsoft.TeamFoundation.PowerTools.CommandLine.CommandLine.Main(String[] args)
I have run things in admin and that makes no difference.
Here is what I get when i run the TF command.
C:\Program Files (x86)\Microsoft Visual Studio 14.0>tf
Microsoft (R) TF - Team Foundation Version Control Tool, Version 14.0.24712.0
TFS is working fine in VS. When I had VS2013 and TFS Power Tools 2013 everything was working fine. What else do I need to do to get this working?
edit: I have resolved the command line issue, but now the shell extension isnt working. I do not see the green check boxes in windows explorer, and when i right click a folder I do not get a TFS option. I am noticing multiple processes for it which is obviously does not seem good. Continues to create new processes until memory problems arise.
Additionally, Seeing these 2 events in the windows log.
Log Name: Application
Source: TFSShellExt
Date: 9/25/2016 7:25:40 PM
Event ID: 3
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: MyComp
Description:
TFS Shell Extension event:\n Failed to start COMProvider while updating workspaces.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="TFSShellExt" />
<EventID Qualifiers="32770">3</EventID>
<Level>2</Level>
<Task>0</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2016-09-25T23:25:40.000000000Z" />
<EventRecordID>156525</EventRecordID>
<Channel>Application</Channel>
<Computer>MyComp</Computer>
<Security />
</System>
<EventData>
<Data>Failed to start COMProvider while updating workspaces.</Data>
</EventData>
</Event>
and
Log Name: Application
Source: TFSShellExt
Date: 9/25/2016 7:25:40 PM
Event ID: 3
Task Category: None
Level: Warning
Keywords: Classic
User: N/A
Computer: MyComp
Description:
TFS Shell Extension event:\n More than 5 failed calls to com provider.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="TFSShellExt" />
<EventID Qualifiers="32770">3</EventID>
<Level>3</Level>
<Task>0</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2016-09-25T23:25:40.000000000Z" />
<EventRecordID>156524</EventRecordID>
<Channel>Application</Channel>
<Computer>MyComp</Computer>
<Security />
</System>
<EventData>
<Data>More than 5 failed calls to com provider. </Data>
</EventData>
</Event>

Answer 1

I just tested with my VS2015.3 and PowerTools on my machine, but couldn't reproduce your issue:
The error complains Could not load file or assembly 'Microsoft.TeamFoundation.Common, Version=12.0.0.0', you may try to clean the cache in C:\Users\username\AppData\Local\Microsoft\Team Foundation\x.0\Cache to see whether it helps you.