i have dell laptop model N5110 Inspiron core i5 with 500 GB hard drive...laptop working very slow and it takes too long time to load window .i run the dell diagnostics,it showed all devices working properly except hard drive .i got this error message
 Error Code 2000-0151
validation 35089
msg: hard drive 0- S/N S2TDJ90C109549, incorrect status = 3E 
no additional sense information.

plz help me.i cant understand what problem with hard drive.tell me what i should do ?