Now i have face with the problem of installation for compaq cq40 300au.
The machine say that check your hard disk with that command "chkdsk -f".
But Windows Vista can be installed into. Now i want to use my laptop with windows XP.
If anyone can solve that problem, please reply that.
you mean you need to downgrade your computer from Windows Vista to XP?
if so is the case, you need to go to the BIOS in the Boot menu, select IDE from ACPI.
put the boot option to boot from CD first or disable Boot from hard disk.
then you will be able to downgrade your computer from Vista to XP.