can anyone help me. I have a new HP640c worked good until the other day after usingSystem Mechanic. I must have deleted some needed files when using the Program(aka:junk files) my new burner will not burn dvd's at 16x any longer, real slow and then fails. It used to work fine. I tried re-installing the drive no-good. although I burnt a cd at 40x and worked fine. I have attached a log file any help would be appreciated.