Cannot Install Driver - Missing avidinstaller.msi

Windows installer complains it cannot find avidinstaller.msi in my temp folder. I am trying to run USB_MIDI_Series_Installer_5_0_1_Driver_5_10_0_5139.exe

I have installed succesfully earlier today (and uninstalled and installed etc) but fear my last uninstall did not complete gracefully.

Am using Windows 7 64bit. The driver still appears in the list when I look at "Uninstall or change a program" but if I try to repair or uninstall from there I get the same error.
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