Troubleshooting

I am using Windows Vista (or Windows 7) and I can't change the inventory quantities.
The dBumper client computer won't connect to the database.
When installing SQL Management Studio Express on Windows Vista x64, I get an error that says "The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 29506".
I get an error message when installing SQL Server 2005 (or SQL Server 2008) that says "The file C:\Windows\Microsoft.NET\Framework\[version_number]\mscorlib.tlb could not be loaded".