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There is a problem with your windows 8 PC's installation, which has stopped it from booting correctly; hence why it starts in 'startup repair', and tries to diagnose your PC. Hold the F8 key while booting your computer to go into the startup menu for Windows; click Advanced startup options; and select Restore my PC; which will reinstall windows.
This may or may not work for your machine, you may have to hold F2, F10, or the Escape key to go into the UEFI setup and go into startup options from there.
which setup are you reffering to? If you want to access BIOS setup you can do so by clicking F2 or F12 immediately at the start-up. If you want to locate the operating system setup that is only accesiable once you boot teh System and that depends on the Operating System taht you are using.
1. Restart the Acer Aspire netbook by pressing the "power"
button on the netbook's keyboard or by pressing the "CTRL," "ALT" and "DEL"
keys at the same time.
2. During startup, hold down the "F8" function key
immediately when you see the "Acer" splash screen and the option for entering
3. Keep pressing the "F8" key until the "Advanced Boot
Options" menu appears.
If you receive a "keyboard error," restart the Acer Aspire
and repeat step 2.
4. Use the arrow keys to navigate to the "Safe Mode"
selection on the "Advanced Boot Options" menu.
The arrow keys are located on the right-hand side of the
Acer Aspire keyboard.
5. Press the "Enter" key to execute the "Safe Mode"
The Windows operating system will now start in "Safe Mode"
and you can perform a system restore or make needed changes to get your Acer
Aspire to boot normally again.
Turn the computer off all of the way by holding in the power button until it shuts off.
Turn it back on and immediately start tapping the F8 key. It should bring you to a menu that has an option for going to "Last Known Good Configuration". Choose that option and see if it boots up.
If pressing F8 doesn't bring you to the menu - you may need to run diagnostics on the computer. To get to the diagnostics, attempt to boot to the Boot Menu by pressing F11 or F12 at the boot screen and see if it gives you the option to run diagnostics.
Most likely a Windows software problem. Could be virus caused. Try restarting the laptop and immediately start tapping the f8 key until you see a screen with several boot options.Use the arrow key to select "boot using last known good configuration". If that works, you're done. If not, try restarting the laptop and immediately start tapping the f8 key until you see a screen with several boot options. This time select "boot in safe mode". The laptop screen will look different but will still allow you to run your laptop. Click on the "Start" button, then "Help and Support" and then "Undo changes to your system using system restore". Click on "Restore" and then select a date shown in BOLD when your laptop was running fine. Have the laptop restore to that date. After restarting, you should have full functionality. If this doesn't work, you may have a failing harddrive. Try reinstalling Windows. If it fails during loading, your harddrive is most like failing and should be replaced. If reloading solves the problem, you had corrupt software probably caused by a virus attack.
When powering up from a cold start press F8 as if tapping on a piano. You may get a boot from what screen first, in this case press Escape and then F8 immediately thereafter. You should then see a Safe Mode Selection boot screen. Options include, Last Known good configuration. Often this is a good choice. Sometimes you are presented with a selection of Restore Points to choose from as well. These all depend on the Bios you have and what version of that bios is installed.
Do the F8 tap tap until you get the Safe Mode boot screen. When you do choose Safe Mode, you are then asked what OS to boot, usually this is only the version of XP or Vista you have onboard. In any case take that and press Enter again.
Don't dismay should you not get the F8 key press right the first time, there is a certain knack to it.