I recently helped with my mates Laptop after it started to run very slowly
Now he is getting the following message on start up
We apologize for the inconvernience, but windows did not start successfully. A recent Hardware or Software change might have caused this.
If your computer stopped responding , restarted unexpectedly or was automatically shutdown to protect your files and folders, choose last know good configuration to revert to the most recent settings that worked.
If a previous startup attempt was interrupted due to power failure or becasue the power of reset button was pressed, or if you aren't sure what caused the problem, choose Start Windows Normally
I have ran through the list of options given (Safe Mode, Last Known Good Config, Start Wind. Normally Etc.) but always end up back at the 'We apologize for the inconvernience, but windows...' mesage with the same options
Previous to this problem, he was running without any security on the laptop, so I sorted this with the following items