It's like, every five seconds. And I can't re download it because of these three things:
1. All my songs will be deleted off my iTunes
2. A sign will come up in place of Limewire saying "A necessary document is required to start" or something of the like, and it comes up every 5 seconds or so.
3. I already tried re-downloading it, it STILL opens every 5 seconds.
While typing this, Limewire has come up 18 times. How can I stop this? Also, ever since this started, CTRL+ALT+DEL don't work, so I have a feeling Limewire is tampering with my computer.
How do I fix this NOW?

First off ... Your probably Infected. Reason for the continual Opening.
Try this.

AVG(free) might be able to fix it. Be sure to update it before you scan your computer: AVG Free Advisor: AVG Anti-Virus Free, then follow the prompts.
Once AVG has fixed the Problem you can delete it if you want to.

If AVG doesn't fix the Infection problem, then Try this.

To fix the limewire keeps popping up / no taskmanager bug do the following

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