Hi Roger,
1. What is the make and model of the PC?
2. Are you aware of making any hardware or software changes to the PC prior to this issue?
I would suggest you to follow these methods and check if it helps.
Method 1:
Try and perform a System Restore from Advanced Options screen.
System Restore allows you to restore your computer to a previous state quickly and easily without losing any of your files or personal settings.
Follow the steps:
a) After you boot your computer using Windows DVD or System Repair Disc, a black screen appears with gray text "Press any key to boot from CD or DVD". Press any key.
b) Select the correct time and Keyboard type.
c) Click Repair your computer in the lower left corner.
d) Select Troubleshoot from Choose an option screen.
e) Click Advanced options in Troubleshoot screen.
f) Select System Restore.
Method 2:
If that does not help, then follow these steps to get in Safe Mode.
a.Boot from the Windows 8 DVD.
b.Select
Next in the first screen.
c.Select
Repair your computer option and select Troubleshoot.
d.Then select
Advanced Options and select Command Prompt.
e.Type
Bcdedit /set {bootmgr} displaybootmenu yes (take note of spaces).
Press Enter
f.Type exit
g.Reboot the computer.
h.At the boot screen Press F8.
i.Select “Safe mode”.
Refer to the article:
http://support.microsoft.com/kb/2809468/en-us
Then, try to perform a
system restore.
Let us know if it helps. If the issue persists, please reply, we will be glad to assist you further.