Try running a Startup Repair three more times.
You could also try booting to the Recovery Management if you have not deleted the Recovery Partition or the PC/Laptop did not come with one.
To boot to eRecovery, try pressing ALT+F10
at the same time simultaneously, then select Restore to factory defaults
. Select OK
and the restoration process will begin. Finally press OK
You will lose your data whilst trying to attempt this
You may also be able to purchase an Acer Recovery Disk if you do not have one: Acer Store | Recovery CD
If this fails, your last option would be a Clean Install or a Repair Install