This is a real pain in the ass. I just installed a new copy of Visual Studio Team Suite on my new laptop. This is a brand new XP install and VS.NET is about the third thing installed after Office and SQL Server 2005. The install completed just fine but upon starting VS I get several package load errors right from the get go.
Both of these seemed unrelated or not to cause any problems:
Language Package
Data Transformation Packge
But after running for a few minutes it became really obvious that the entire environment is hosed to some degree, specifically the configuration options. Not sure if this is because of the above but I can't configure the fonts for VS.NET. Check this out:

Notice the Show Settings dropdown: There are only three options in the dropdown with the default showing [All Text Tool Windows]. There are no text editor options, and any changes made to the above defaults has no effect whatsoever.
A little lower in the options dialog there's more weirdness – a blank node in the tree. You can expand but there's nothing there. This can't be good.

So, I ran a repair install just to make sure. What a joke that is – the repair install takes 3 times as long as the original install and - get this - restarts the machine 3 times! Restart 3 times? All the stuff is already installed – the original install never rebooted.
Up to now I've been running VS 2005 Professional before without problems so I suspect this is an issue with the Team System install. Everything else seems to work Ok that I've tested at this point, but this is frustrating as hell. The font formatting again is crucial, as I'm giving presentations on this box and 10pt Courier isn't going to cut it.
I just can't understand how Microsoft can fuck up the installer so bad that VS.NET doesn't install on a clean copy of XP. You can't get a more common environment…
What's even worse is that these errors are EXACTLY the same errors I was receiving during the beta when I installed CTPs on VPC and on a separate machine. I talked to several MS folks about this at the time and while they all nodded their heads in agreement apparently nobody bothered to check this out…
Maybe I'm just error prone <g>… but c'mon I can't be the only one having this particular problem and this time around nobody can blame it on my overabused machines. What a freaking waste of time all of this is. The re-install took well over an hour even on this fast machine.