WinPVR wrong capture size in Windows XP..

[koepcke]

I captured a small VCD sequenz (WinPVR, Windows XP).When I first played it with Zoomplayer the size (352*288) was correct.If I view it seconds later the size changes to 522*288.Tha same happens to mpeg2 captures.
If I boot to Windows 98se and do the same everything will be fine.
Where is my problem????