Windows Movie Maker Crash

I am running Windows 7 64-bit and have had Windows Movie Maker 2012 for around 5 months. It did not give me any trouble until recently. I try and import the same type of video files as I have in the past, but this time Windows Movie Maker 2012 gets really slow and then crashes. I looked on the forums and saw that Windows Movie Maker 2011 would work, but upon saving my project, the program does not respond and it crashes as well. Nothing has changed with my computer over the past 5 months and the program suddenly does not cooperate. I have tried uninstalling and then re-installing the software several times, but I still end up with the same problem. Is there anything I can do? I have tried all other free editing softwares and none work as fast and as well as this. Help please!