There are messages popping "...exe" file corrupted, please run chkdsk ultiliy. I did 'start' 'run' 'cmd' then 'chkdsk /f/r' ....chkdsk can not lock current driver...use by another process...do you want to start chkdsk at startup 'y' for yes. At startup, ....chkdsk cancelled. I tried 'computer' 'c:' right clip 'property' 'tool' 'check now' and tick 'automatically fix file system error' and 'scan for and attempt error recovery for bad sector' then start' then there is a message 'disk check could not be performed...do you want to schedule this disk check to ru the next time you start your computer ' 'y' for yes. At startup, ...chkdsk cancelled. How to enable chkdsk?