Omnipage is used to convert scanned text to regular text, as far as I can tell. The only free windows screenreader I know to exist, that is powerful enough for day-to-day use (but doesn't have braille support, I don't think) is NVDA, NVDA
But, yeah, mobile speak was an excellent deal, because I have internet access on my phone and can comfortably take my work anywhere without lugging a laptop and a braille display- just a tiny phone and my 12-cell bluetooth braille display, which is also very small.
