Nikon D5100 Video / Youtube

I recently decided to start making YouTube videos with my Nikon D5100, but i was terrible disappointed afterwards.
I was planning to use windows movie maker to edit my video but i found out that Windows movie maker doesn't support the Nikon D5100 File. Thus, it didn't let me upload the video to edit it.
So i went online, searching, and i found out i need a video converted. I searched for the best one to use for the Nikon D5100, got the trail and after it converted the video yet again i was disappointed. The video converter killed my audio and the quality of my video as well as made it very slow.
And this is where i need help. What should i do?
Should i get another editing software other then Windows movie maker?
What kind of video converter should i use? (Because supposedly i got a trail to a very good one and apparently it was suppose to work great with my cameras video and it didn't.)

If you have any tips, suggestions or anything like that let me know because i'm new to making youtube videos, and i want to start making high quality, smooth looking videos. And i do see that people use Their Nikon D5100 Camera to film and when they post it on YouTube, its flawless.

So please let me know.

Being a Canon guy I'm not familiar with Nikon dslr cameras but lets see how I may be able to help.
I checked the specs on this camera but couldn't find the video recording format so I'll assume, since WMM won't take it that is mov. Mov is an apple format so Windows won't run it.

Converting is a bad idea. I've been there and done that and it always costs you quality. What you really want, as I see it, is an editor that takes mov files so you don't lose quality.

I recommend Video Pad by NCH software because I use it. It takes my Canon mov files easily and edits them with no loss of quality… Like this on my You Tube channel.

Video Pad has a free 30-day trial and is pretty easy to learn if you can take time with it. Once you learn it there's really nothing to it.

After the original 30-days you'll be required to buy to keep using it. You can convert your down load to the full use program for about $75. I prefer to have the original disc so in case of a crash I don't have to go back to the company to re-download… That was $100 if an owner's manual.

Either way, you really can't lose with this program given its price.

Windows Movie Maker is meant for light duty editing. It seems most people convert to a different format which destroys the quality. If you're hell bent on using Movie Maker, then learn to convert with a program called FFMPEG. It's command line, extremely capable, and extraordinarily hard to figure out. You could probably change the container (MOV to a Microsoft movie format) and copy the contents (H.264) without affecting the quality.

If you're serious about your video editing endeavors, get something like Vegas which will handle the format the D7000 uses. You can get watered down versions of the editor branded as Movie Studio Platinum and Movie Studio for $100 and $50 respectively. You can download a free trial to see if you like it. There are other video editors out there which are in this price range which work equally well. Note, these editors are on the complicated side, but you should be able to do things within 30 minutes. Learn to use the program on short clips (10 seconds) from editing to rendering. Once you mastered that, then do your main project.

http://www.sonycreativesoftware.com/vegassoftware