I have a problem. My dvd drive's have low burst rates and when I burn dvd's they sometimes have pauses in them now. this is something that just somehow happened in the past couple weeks. i put my pc together a year ago and haven't had any such problems before. i suck at troubleshooting. any ideas on what I should do? i've backed up all my important stuff onto an external so i'm ready to do a fresh install of windows. i just really don't want to do it unless i have to.