Video plays choppy after finished with WMM for Windows 8.1

I have been using WMM since 2011, and had no problem. I use pics to make all my vids, and all of them are smooth when playing. I remember using Windows Live Essentials 2011 on my Windows 7 laptop. Laptop died and i got a Windows 8.1 computer, and the first thing i did was downloading WMM. The available version for my O.S. is the WLE 2012, and after finishing another video, in some parts it played choppy. I tried erasing it and saving it again, but the results were the same. Then i made one more video, and it plays choppy as well. This time i tried uninstalling the whole WLE 2012 pack, and installing it again, but there was no improvement. Then i went to get Windows Live Essentials 2011, but is no longer available to download. I enjoy making vids, but is sad that my job is ruined for the choppy issue. Hope there is a solution for this problem with WMM 2012, or if you can help me, i'll appreciate it.