HP ProDesk 400 G1 Maintenance And Service Manual page 96

Computer will not continue after HP logo screen displays.
Cause
"Illegal Operation has Occurred" error message is displayed.
Cause
Software being used is not Microsoft-certified for your version of
Windows.
Configuration files are corrupt.
88 Chapter 6 Troubleshooting without diagnostics
Solution
Windows installation disc or a system repair disc that you created
earlier.
In Windows 8.1, use Automatic Repair to fix problems that might
prevent Windows from starting correctly.
To access Automatic Repair:
1. Press the Windows logo +
2. Select Change PC Settings, select General, and then under
Advanced startup, click Restart now.
3. Select Troubleshoot, select Advanced options, and then
select Automatic Repair.
Windows starts Automatic Repair.
4. Select the account to use to begin Automatic Repair, and
type the password for the account.
Windows diagnoses the computer and attempts the repair
it.
Solution
Verify that the software is certified by Microsoft for your version
of Windows (see program packaging for this information).
If possible, save all data, close all programs, and restart the
computer.
l to open the Settings charm.