Presario cq61 getting as far as the windows and start up page

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Hello,
Please help my laptop is now getting as far as the windows and start up page but when
I try to go any further it says windows cannot connect to the system notification service review the system event log file
Or details why the service didn't respond the problem prevents standard users from logging onto the system as an administrative user you can review system event log for details please help I don't have a clue thankyou