Newbie wonders about PAL conversion

I captured some old camcorder PAL footage using a game capture device, and I presume it was captured at 25 fps. However, when I bring it into Video AI 4, the program insists the input is 60 fps and won’t let me change that. This means, I think, that I can’t take advantage of frame interpolation.

So, how wrong have I got this? TIA.

1st of all we need to determine what is the real FPS the video is storing in it’s metadata info and we need to see rather it is interlaced or progressive scan.
Download and Install MediaInfo tool. after installation right click on the video and select MediaInfo


and post here what is the reported FPS and the scan type