Windows Live Movie Maker is not working....?

[Awesomeness Bunny]

hey there! My Windows Live Movie Maker hasn't been working for a while now.
First off- it started with a yellow exclamation over videos. This would happen very often and i would have to restart the editing process. This happened for a couple weeks. Eventually, i thought i could reinstall it in case of any updates, bugs, etc. I reinstalled/downloaded it from the Microsoft website. This time, it opened but soon said "Windows Live Movie Maker has stopped working". Now, it won't even open before this message appears.
So... a few questions...
1.) Is something wrong with my computer or software?
2.) Is it possible to fix this?
3.) Can i work on Windows Live Movie Maker again?
I have a Windows 7, Dell laptop, btw.
-Thanks in advance