I have a ACER Aspire 5532 (Windows 7) and once turned on it says:
Windows failed to start. A recent hardware of software change might be the cause. To fix the problem:
1.Insert your Windows installation disc and restart the computer.
2.Choose your language settings, and then click "Next".
3.Click "Repair your computer."
If you do not have this disc, contact your system administrator or computer manufacturer for assistance.
Info: The boot selection failed because a required device is inaccessible.
I decided to restore the laptop to factory settings by inserting the System Disk (only one) and 3 recovery disks...everything goes right until the end of the 3rd disk when the system prompts the following error code 1117 I/O device error.