thanks for your links,but cannot change settings
my 60gig HD is broken into 3 partitions ,CD and E,
I cannot change settings below as its "greyed out"!
Turn off the "Enable write caching on the disk" feature:
Note If you turn off the "Enable write caching on the disk" feature, your disk performance may decrease. Because of this, you may want to monitor system performance after you complete the following procedure.
In Windows Explorer, right-click your hard-disk, and then click Properties.
Click the Hardware tab.
Click the hard disk, and then click Properties.
Click the Policies tab.
Click to clear the Enable write caching on the disk check box, and then click OK two times.