Add-ins are stored in registry. For VS2003 here is the key example.
Check your registry.
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\7.1\AddIns\SolBookmarks.Connect]
"FriendlyName"="SolBookmarks"
"Description"="SolBookmarks desc"
"LoadBehavior"=dword:00000000
"CommandLineSafe"=dword:00000000
"CommandPreload"=dword:00000001
>I have just experienced the disappearance of all Add-Ins on two machines
>which started on Saturday May 7 2005. In trying to reinstall them, I was
>offered the option to 'Repair' which I selected. Upon completion of the
>repair, the add-ins still did not appear nor were they in the Add-In Manager
>list. I am running the lastest version of XP Pro SP2 if that is any help.
>Just wonder if anyone else has had the same experience.
Tadd Stuart - 09 May 2005 12:40 GMT
I was missing the AddIns folder in the registry so I then issued a System
Restore to last Thursday which broght my AddIns back. According to the VS
AddIn Manager, I have 8 AddIns listed yet the AddIns folder only shows one of
them. Is there another location in the registry for these AddIns? One example
is the CodeHound AddIn which is quite helpful.
> Add-ins are stored in registry. For VS2003 here is the key example.
> Check your registry.
[quoted text clipped - 11 lines]
> >list. I am running the lastest version of XP Pro SP2 if that is any help.
> >Just wonder if anyone else has had the same experience.
Carlos J. Quintero [.NET MVP] - 10 May 2005 11:35 GMT
VS.NET 2002 (7.0) and VS.NET 2003 (7.1) can registry add-ins in 2 registry
keys. For VS.NET 2003 they would be:
(for all users)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\7.1\AddIns\
(for the user who installed the add-in)
HKEY_CURRENT_USER\SOFTWARE\Microsoft\VisualStudio\7.1\AddIns\
VS 2005 will allow XML registration too, avoiding the Windows Registry.

Signature
Best regards,
Carlos J. Quintero
MZ-Tools: Productivity add-ins for Visual Studio .NET, VB6, VB5 and VBA
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"Tadd Stuart" <TaddStuart@discussions.microsoft.com> escribió en el mensaje
news:3785EF91-B39F-40D8-8175-E1A26D20F403@microsoft.com...
>I was missing the AddIns folder in the registry so I then issued a System
> Restore to last Thursday which broght my AddIns back. According to the VS
[quoted text clipped - 3 lines]
> example
> is the CodeHound AddIn which is quite helpful.