Have you installed any new hardware or software and is the error your getting got a blue backround if so its windows crashing depending if you can give me more detail i might be able to help
no new software or hardware was installed and the backround is black as it wont start all that comes up is the acer loadin page an then the launch startup repair which doesnt do anythin/ start normally an then it tries to start wiv the microsft corporation loading bit