What camera do you have and what software are you using on your Windows Computer?  What version of Windows?

Windows 7 now supports RAW formats in Windows Explorer if you install the Codec Pack here: -

http://www.microsoft.com/download/en/details.aspx?id=26829

If you need an up-to-date version of PMB, have a look here: -

http://esupport.sony.com/US/perl/news-item.pl?news_id=376&mdl=DCRSX40