Uninstall

Visual Studio 2010 and newer

In each IDE in which Visual Assist is installed, use the Extension Manager to uninstall Visual Assist:

IDE | Tools | Extensions and Updates
or
IDE | Extensions

Restart your IDE.

Optionally, you can reclaim a small amount of disk space if you do not intend to install another build of Visual Assist by deleting the directory containing user-defined VA Snippets, local dictionary, and small caches:

%APPDATA%\VisualAssist

If you want to remove all traces of Visual Assist, delete the registry key:

HKCU\Software\Whole Tomato

Visual Studio 2008 and older

Exit your IDEs, and uninstall Visual Assist using the Control Panel of your OS:

Windows | Control Panel | Add/Remove Programs
or
Windows | Control Panel | Programs and Features

Delete the directory containing symbol databases and large caches if you do not intend to install another build of Visual Assist:

%APPDATA%\Local\VisualAssist

Optionally, you can reclaim a small amount of disk space by deleting the directory containing user-defined VA Snippets, local dictionary, and small caches:

%APPDATA%\VisualAssist

If you want to remove all traces of Visual Assist, delete the registry key kept for debugging of installation/removal of Visual Assist:

HKCU\Software\Whole Tomato