If you don't get this error when you start in Safe Mode, try running MSConfig (Sart-Run-msconfig) Click on the "Services" tab. Tick the box for "Hide All Microsoft services. Disable all the remaining services, OK out of the System Configuration Utility and restart. If the problem has gone, restart the System Configuration Utility and put the tick in the box to re-enable the most important services - starting with the antivirus ones. Restart the computer. Keep doing this until you find which application is the culprit.