Visual C# Express 2008 won't start

I think I'm getting to the root of the problem: .NET Framework 2.0 (with service pack). I tried reinstalling it, but the uninstaller was corrupt. Unsurprisingly, the installer said that .NET Framework 2.0 was already installed. So then I tried the instructions on http://support.microsoft.com/default.aspx/kb/908077 but they didn't help. On top of that, all .NET Framework (un-)installers broke. What do I do?

Here's the uninstaller log of .NET Framework 3.5 SP1:
[03/31/09,19:37:48] Microsoft .NET Framework 2.0a: [2] Error: Installation failed for component Microsoft .NET Framework 2.0a. MSI returned error code 1635
[03/31/09,20:13:57] XPSEPSC Installer: [2] Failed to fetch setup file in CBaseComponent::PreInstall()
[03/31/09,20:13:57] setup.exe: [2] ISetupComponent::Pre/Post/Install() failed in ISetupManager::InternalInstallManager() with HRESULT -2147467260.
[03/31/09,20:13:57] setup.exe: [2] CSetupManager::RunInstallPhase() - Call to Pre/Install/Post for InstallComponents failed
[03/31/09,20:13:57] setup.exe: [2] CSetupManager::RunInstallPhaseAndCheckResults() - RunInstallPhase() returned a NULL piActionResults
[03/31/09,20:13:58] setup.exe: [2] CSetupManager::RunInstallFromList() - RunInstallPhaseAndCheckResults failed [2]
[03/31/09,20:13:58] setup.exe: [2] ISetupManager::RunInstallLists(IP_PREINSTALL failed in ISetupManager::RunInstallFromThread()
[03/31/09,20:13:58] setup.exe: [2] ISetupManager::RunInstallFromThread() failed in ISetupManager::RunInstall()
[03/31/09,20:13:58] setup.exe: [2] CSetupManager::Run() - Call to RunInstall() failed
[04/05/09,12:50:56] Microsoft .NET Framework 3.0 SP2 x86: [2] Error: Installation failed for component Microsoft .NET Framework 3.0 SP2 x86. MSI returned error code 1603
[04/05/09,12:51:37] Microsoft .NET Framework 3.5 'package': [2] Error: Installation failed for component Microsoft .NET Framework 3.5 'package'. MSI returned error code 1603
[04/05/09,12:52:32] WapUI: [2] DepCheck indicates Microsoft .NET Framework 3.0 SP2 x86 is not installed.
[04/05/09,12:52:32] WapUI: [2] DepCheck indicates Microsoft .NET Framework 3.5 'package' is not installed.
[04/05/09,13:32:47] Microsoft .NET Framework 2.0a: [2] Error: Installation failed for component Microsoft .NET Framework 2.0a. MSI returned error code 1651
[04/05/09,13:34:50] Microsoft .NET Framework 3.0 SP2 x86: [2] Error: Installation failed for component Microsoft .NET Framework 3.0 SP2 x86. MSI returned error code 1603
[04/05/09,13:35:42] Microsoft .NET Framework 3.5 'package': [2] Error: Installation failed for component Microsoft .NET Framework 3.5 'package'. MSI returned error code 1603
[04/05/09,13:36:41] WapUI: [2] DepCheck indicates Microsoft .NET Framework 2.0a is not installed.
[04/05/09,13:36:41] WapUI: [2] DepCheck indicates Microsoft .NET Framework 3.0 SP2 x86 is not installed.
[04/05/09,13:36:42] WapUI: [2] DepCheck indicates Microsoft .NET Framework 3.5 'package' is not installed.
[04/05/09,13:36:42] WapUI: [2] DepCheck indicates Microsoft .NET Framework 3.5LP - NLD is not installed.
[04/05/09,13:43:01] Microsoft .NET Framework 3.5 'package': [2] Error: Installation failed for component Microsoft .NET Framework 3.5 'package'. MSI returned error code 1603
[04/05/09,13:43:35] WapUI: [2] DepCheck indicates Microsoft .NET Framework 3.5 'package' is not installed.

I'm afraid that's a little bit too radical for me. ;-)

Also, when trying to load any existing project, I get this message:
http://img522.imageshack.us/img522/8739/errora.jpg

The associated help page is a dead track:
http://img522.imageshack.us/img522/7352/helppage.jpg

The Solution Explorer doesn't go into much detail either:
http://img522.imageshack.us/img522/2271/error2y.jpg

Recently my Windows partition was slightly damaged, so I had to replace some corrupt files to keep my Windows installation running. It's running just fine, except for this thing. Are there any troubleshooting tools I could use to trace what I assume is a corrupted DLL?

It is a radical solution but it could help:

format the machine and resintall the OS then install VC# of corse keep safe your data in a separate location, I know its a creasy solution.

Uhm... is there any specific framework I should look for? I already reinstalled the .NET Framework (3.5 SP1).

These development-related programs are installed on my PC:
http://img21.imageshack.us/img21/2631/frameworks1.jpg
http://img24.imageshack.us/img24/3517/frameworks2.jpg

May be try and re installing the Frame work itself...

Thanks,
Lisa

May be try and re installing the Frame work itself...

Thanks,
Lisa

As I said, I already tried uninstalling and reinstalling.

try to uni install it an re install other downloaded copy from microsoft site