error code 13 for Windows 7, again

[crowat]

I've been running Free Spotify on my 64-bit Windows 7 Dell (in the UK) without a problem for some time.  (Occasionally when I've run it, it first tells me that it's installing Spotify: I presume it was downloading updates.)

Earlier this week, that process failed, and I have been unable to install or run Spotify.  Typically, I get "error code 13".

I have tried:

1. uninstalling any existing Spotify, both using Windows' Control Panel > Uninstall, and manually looking for username/AppData files
2. booting into safe mode and installing
3. downloading the FullSetup version
4. running in Win XP SP 2 mode
5. running as an Administrator

That error code 13 keeps getting in the way, though.

Does anyone have any other suggestions?

Thank you!