dell hell

I'm completely frustrated with my Dell computer today. I trying to edit the class shoot we did a few days ago. Everything was fine this afternoon but then I took a break and when I came back, it is being all sluggish. It doesn't respond to basic commands, it runs video for up to 20 seconds after I press the pause, and takes forever to do anything. I rebooted a couple of times and now think I should have spent the weekend at the office and got this done properly on the avids.