hi kelsi,
you need to do a format-conversion. if you have FCP youvcan do it with compressor, therefor you could try to use one of apples templates for format-conversion, or you can create your own setting.
but be awared: it´ll take some/a lot time, depending on your frame-control-settings.
if you are not working with FCP you need to take after effects and do the retiming with it.
there is also another workflow if it would be OK, if your video might run 4% slower with 24p (or 29.98NDF).
therefor you need to conform your 25i to 24p, after you have deinterlaced it.
it doesn´t matter which way you´ll go on computer, it´ll take some time.
other option: do a hardware-conversion from PAL to NTSC, but that could only be done with a service-provider.
cheers
danny