VS 2010 constantly crashing with System.AggregateException after installing Visual Studio Async CTP

My VS2010 was rock solid until I made a mistake of installing Visual Studio Async CTP... after that it started crashing all the time and continued crashing even after I uninstalled the CTP, uninstalled and re-installed Visual Studio, and eventhough I do not have any PLINQ in my code...

Note that Problem Signature 09 below and the related System.AggregateException...

AggregateException is used to consolidate multiple failures into a single, throwable exception object. It is used extensively in the Task Parallel Library and Parallel LINQ (PLINQ). For an example, see How to: Handle Exceptions Thrown by Tasks and How to: Handle Exceptions in a PLINQ Query.

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Just wondering if anyone else experienced similar problems and maybe found a solution?

Problem signature:
  Problem Event Name:   CLR20r3
  Problem Signature 01: devenv.exe
  Problem Signature 02: 10.0.40219.1
  Problem Signature 03: 4d5f2a73
  Problem Signature 04: System.Data.Entity
  Problem Signature 05: 4.0.0.0
  Problem Signature 06: 4ba1e2fd
  Problem Signature 07: 1a09
  Problem Signature 08: 6d
  Problem Signature 09: System.AggregateException
  OS Version:   6.1.7601.2.1.0.256.4
  Locale ID:    1033

Additional information about the problem:
  LCID: 1033   

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A co-worker hit the same problem today. Considering that re-installation on your side didn't help I tried the following:

I removed the following folders (renamed them actually, as a quick backup):

C:\Users\<Username>\AppData\Local\Microsoft\Visual Studio\10.0 
<MyDocuments>\Visual Studio 2010

It starts up fine after that. We haven't isolated what in those per-user setting folders caused the problem, but at least you'll be able to continue working.

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When you uninstall Async CTP, there are usually a minimum of 2 uninstalls that need run (I had 4 on my machine). There is one per version of Visual Studio on your machine, and I believe at least 1 uninstall under the .Net Framework.

Make sure you have Show Updates on and remove all instances of it that you can find. Also, I know there is AsyncCTP Refresh for use with VS2010 SP1, and using the regular AsyncCTP library with SP1 will cause problems.

I'm not sure if it will help, but the Version #s shown in this article helped me when I was having trouble with the AsyncCTP installation

Also, I believe you can only have one CTP library installed at any time, so if you use another CTP library you cannot use the Async one as well.

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Can't say for sure; but I think your best step now is to repair your Visual Studio 2010 installation. Takes a while; but you'll probably spend more time trying to find the mouse in the walls rather than just knocking the whole house down.