It could also be a permissions issue; you could try running BiaB As Administrator and see if that helps.
Right-click the program icon and select Run as Administrator.

I reckon Pipeline's suggestion would work, but in case it doesn't you have another option.
If you do find TEMPMAIN.WAV in your BB folder, try renaming it to TEMPMAIN2.WAV or similar so BiaB doesn't find it and has to create a new one ... if that works you can probably delete the old one (or listen to it and see what it is and if you need it)


Make your sound your own!
.. I do not work here, but the benefits are still awesome