Its a software problem then. Unfortunately that's beyond my scope. When I use windows to burn it always just works. I can't imaging what could be messed up.
The only thing I can think to try is to reinstall your burning software and check to see if there are any updates available.
You might want to search
http://support.microsoft.com to see if others have reported this problem and see what MS tech suggest for fixes.
The other idea is to revert to a previously known good configuration by pressing F8 when you boot and select it from the menu.
However, any software installed since the last known good configuration will disappear.
My guess is an upgrade from MS or a software you installed broke something. Sorry I can't be more help.
Raydude