I keep getting a pop-up message on my screen that says that a file is faulty or corrupted, and tells me to run something called CHKDSK. I assume this is short for 'check disk' and have found this mentioned in the Microsoft help page, but the instructions are a bit daunting for this 70-plus person, and I can't see how to run chkdsk. Any advice will be very much appreciated. Mal in W. Australia