I’ve been having a bizare problem with Windows Installer on a fresh install of Windows 7 – I’ve been unable to get MSI installs to work with the constant error that another install is already running.
After a quick bit of diagnostic hunting in the event log I came across a recurring install “Microsoft Visual Studio Tools for Applications 2.0 – ENU”. Hmm. It was failing as it was unable to find the directory “”. So I created it. And amazingly the install completed successfully and I can finally install app again.