The picture and audio recorded by using DV of presentation files are out of sync and the latter sounds.

Adding more video effects in the presentation files may cause this problem. More video effects demand higher CPU consumption and cause discontinuous video clips. !§Non-real-time!‥ recording probably helps on this problem. Use !§Start!‥ -> !§Execute!‥ -> Type !§regedit!‥ -> Registry program starts up -> Go to
HKEY_CURRENT_USER\Software\CyberLink\StreamAuthor\3.5\Version\Kernel\IsRealTime
Set value of !§IsRealTime!‥ to !§0!‥ (Zero)

Note: When you stop recording at non-real-time mode, file converting messaged is prompted and converting process is required.  Make sure you wait until the process is completed.