It shouldn't run on start unless you have set it up to run and usually
that's once although you could set it up every time.
This is an explanation of how chkntfs works:
http://support.microsoft.com/kb/160963/EN-US/
I would run a chkdsk /R when you run it (it can be lower case).
There is a conflict with people who have a certain HP 5100C Scanner,
http://support.microsoft.com/kb/316506/en-us
and there is also this KB
http://support.microsoft.com/kb/831426/en-us
CH
"BIG BOY" <> wrote in message
news:...
> On my Vista computer on restart and or reboot, CHKDSK goes on 50% of the
> time.
> What is the normal ratio, if any ?
> Is excess frequency a sign of trouble ?