Comment 3 for bug 400073

another small update: just noticed there are a whole bunch of pyl??.tmp.exe files left over in the temp dir which are not deleted when the installer crashes - another little bug.

Also, I've found forum messages which sound like the same problem (e.g. http://ubuntuforums.org/showthread.php?t=1171021), which say this affects Vista and Windows 7 as well.

It actually smells like a configuration parse error or something similar, coupled with missing error handling (no notification and no cleanup).