I just had that same exact problem. Go and make sure that your windows updates are all updated and stuff and that worked for me.
I looked at there support and this is what I saw.they say Visual Studio instead of C# but its the same i guess. try em out worth a try..
- This error message indicates that other Setup programs might be running on the computer. After the other Setups have finished, restart the computer and then run Visual Studio 2008 Setup.
- Windows Updates might be installing on the computer. Wait for the Windows Update installations to finish and then restart the computer and run Visual Studio 2008 Setup.
- In Task Manager, check whether msiexec.exe is running. If msiexec.exe is running, wait for it to finish and then restart the computer and run Visual Studio 2008 Setup.
- If none of the listed resolutions apply to your problem, restart the computer and then run Visual Studio 2008 Setup.
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