After jumping through flaming hoops, I've managed to get Visual Studio 2005
Team Addition for Developers to install. But when I run it, I now get the
following errors:

Five times on startup:
Package Load Failure
Package ‘Visual Studio Common IDE Package’ has failed to load properly (GUID
= {6E87CFAD-6C05-4ADF-9CD7-3B7943875V7C} ). Pleas contact vendor for
assistance. Application restart is recommended, due to possible environment
corruption. Would you like to disable loading this package in the future? You
may use ‘devenv/resetskippkgs’ to re-enable package loading. YES NO

Twice on startup:
Package Load Failure
Package
‘Microsoft.VisualStudio.TestTools.TestCaseManagement.QualityToolsPackage,
Microsoft.VisualStudio.QualityTools.TestCaseManagement, Version=8.0.0.0,
Culture=neutral, PublicKeyToken=b03f5f57f11d50a3a’ has failed to load
properly (GUID = {A9405AE6-9AC6-4F0E-7AFE45F6FCB7} ). Pleas contact vendor
for assistance. Application restart is recommended, due to possible
environment corruption. Would you like to disable loading this package in the
future? You may use ‘devenv/resetskippkgs’ to re-enable package loading. YES
NO

If I choose to disable loading of the package, it renders VS completely
useless as one might guess.

When I exit the program, I receive above error again twice and Visual Studio
connects to Microsoft to report the problem.

I went ahead and re-installed VS, choosing the repair option. Same thing.

Ideas?