Source: http://lifehacker.com/5551295/enable-motion-interpolation-for-movies-on-your-pc
While it is technically closer to what we see in real life, a lot of people are so used to watching video at 24 frames per second, that faster frame rates seem "fake" to them. Part of this is likely because the smoother motion is somewhat similar to what we see in soap operas (a lot of people describe it as the video looking like it's going 1.5 times faster, but actually moving at actual speed). If you haven't tried watching movies at a faster frame rate, or if you're already a fan but don't want to shell out for a 120Hz television, you can enable motion interpolation on your PC.
You'll need a fairly decent computer to pull this off; Tested recommends a good dual core processor for watching 720p video and probably a quad-core for 1080p. It also involves installing a few different programs and manually copying plugins into directories, as well as copying and pasting a bit of script, but it isn't too difficult—it just might take you a bit of time. Note that while the guide mentions re-installing ffdshow from scratch, it doesn't provide the link. You can get the installer package here.
I tested this myself and can confirm that it works on my 15" MacBook Pro in Windows 7 64-bit, and I did notice quite a difference. It's a bit distracting at first, but it definitely changes the way you watch certain types of fast-paced video, such as sports or some of today's cluttered, hard-to-follow action sequences (I'm talking to you, Transformers and The Bourne Ultimatum). It definitely takes a bit of getting used to, but if you're curious and want to see what it looks like before buying a new TV, it's definitely worth trying out. Hit the link for the full guide, and let us know your thoughts in the comments.