Both Windows Vista and Windows 7 can support 3D Panorama while Windows XP does not support.
If the output file size is too large, it may cause the high memory usage and may fail to make panorama. Please try to stitch with small size photos.
Please try to select other stitch methods such as Horizontal, Vertical to stitch again. Or you can manually adjust the stitch point by clicking on the Manual button before stitching.
If you are using the NVIDIA® CUDA™, the program will automatically enable this to accelerate the stitching process. You may disable it by clicking on the Setting button on the left top corner and uncheck the option Enable NVIDIA CUDA.
Please note that the program supports QuickTime version 7.5 or above.