lorraine
this happened to me a while back .this problem was only on one partition rest scanned perfectly .did same as you ,same operating system
scandisk is the program that is running and writing to disk
went into scandisk advanced options and switched off it's ability to write to the disk, problem solved. if this was the correct thing to do (problems down the line) i dont know it worked for me anyone else like to comment
is this some sort of virus ,and if so why did it not affect all the partitions?