is there a way that I can convert my gif animation to an mpeg

Okay, well I downloaded an episode of an Anime and I tried watching it on my RealPlayer. Well, it always like, slows down and halts for a moment (which is a bear because it's subbed). But when it halts, the sound continues so then it catches up, then halts again. In other words, it keeps glitching and makes it impossible to watch the show... Why is my computer doing this and how can I stop it? PS: I have tried in every player including RealPlayer, Windows Media Player, and iTunes. Does the same all three ways. The files are MPEG if that helps.
It's not:
A) Memory. I don't have a shortage. In fact, I have about 230gb left on my hard drive.
B) Internet. It's offline so it doesn't need the internet.
It can be online or a software, or anything else as long as it's free. It can't be a free trial, I don't want a time limit, and I ESPECIALLY don't want a watermark through my video.
I am looking for a player that can handle most types of video files, including DivX, Xvid, MPEG-4, AVI, etc, in addition to DVD and Blu-ray disks. It must also display subtitles. Other required features would be internet capability (wired or WiFi), USB port, and fast start time.
Can anyone with experience recommend something in this category?
got a new flash drive and i saved these mpeg files to play on my dvd but the audio runs slightly faster than the video.why and how can i fix that? it plays fine on the computer though.
I am looking for a FREE (or close to free) that can do the following:

Crop A Video (Trimming edges)
Render in HD
Import MPEG files
Put audio over video
Be compatible with Windows 7