Hi, I bought my tower a year ago, I tried to perform scandisk a couple of times, but it wouldn't work. Being a complete novice I didn't bother too much until I was told it is very important to scandisk and defrag. Obviously the system will not let me defrag because I can't scandisk first. I open up run, type scandisk, select either option it does the same thing whichever I choose. Above the progress bar I get the words, 'Checking file allocation tables', 1 bar appears eventually in the progress bar, then the words change to, 'Checking folders'. After a minute or two it returns to 'Checking file allocation tables', until 1 bar appears in the progress indicator, then it changes to 'Checking folders'. It plays quite happily like this forever, but gets no further. Can you please help, and please no ' techy talk ' I WON'T understand..