Hi, I have problems with my new pc.

I have a Lenovo y50 70, RAM 16GB, HDD 1TB and Windows 8.1 installed. I have been this problem since I bought the pc several month ago. I ve already talked with Lenovo staff but after several resets nothing has changed, they say that it's not an hardware issue.

Is there something I can do? I am now looking at the event viewer in Diagnostic Performance and I can see many critical level operations with event id 100, the general information for one of these are:

Windows has started up: 
     Boot Duration : 180601ms
     IsDegradation : false
     Incident Time (UTC) : 2015-03-28T16:56:51.749414400Z

-

System

- Provider [ Name] Microsoft-Windows-Diagnostics-Performance [ Guid] {CFC18EC0-96B1-4EBA-961B-622CAEE05B0A}

EventID 100

Version 2

Level 1

Task 4002

Opcode 34

Keywords 0x8000000000010000

- TimeCreated [ SystemTime] 2015-03-28T17:00:42.157324700Z

EventRecordID 155

- Correlation [ ActivityID] {30162580-6978-0000-1E26-16307869D001}

- Execution [ ProcessID] 1404 [ ThreadID] 992

Channel Microsoft-Windows-Diagnostics-Performance/Operational

-

EventData

BootTsVersion

2

BootStartTime

2015-03-28T16:56:51.749414400Z

BootEndTime

2015-03-28T17:00:32.392838000Z

SystemBootInstance

14

UserBootInstance

11

BootTime

180601

MainPathBootTime

100346

BootKernelInitTime

35

BootDriverInitTime

827

BootDevicesInitTime

880

BootPrefetchInitTime

0

BootPrefetchBytes

0

BootAutoChkTime

0

BootSmssInitTime

27327

BootCriticalServicesInitTime

4846

BootUserProfileProcessingTime

2126

BootMachineProfileProcessingTime

2874

BootExplorerInitTime

10335

BootNumStartupApps

12

BootPostBootTime

80255

BootIsRebootAfterInstall

false

BootRootCauseStepImprovementBits

0

BootRootCauseGradualImprovementBits

0

BootRootCauseStepDegradationBits

0

BootRootCauseGradualDegradationBits

0

BootIsDegradation

false

BootIsStepDegradation

false

BootIsGradualDegradation

false

BootImprovementDelta

0

BootDegradationDelta

0

BootIsRootCauseIdentified

false

OSLoaderDuration

1145

BootPNPInitStartTimeMS

35

BootPNPInitDuration

4188

OtherKernelInitDuration

3803

SystemPNPInitStartTimeMS

7456

SystemPNPInitDuration

767

SessionInitStartTimeMS

8759

Session0InitDuration

17755

Session1InitDuration

1626

SessionInitOtherDuration

7945

WinLogonStartTimeMS

36087

OtherLogonInitActivityDuration

48922

UserLogonWaitDuration

40042

Thanks in advance,

Andrea

AN

First 3 minutes is not abnormal for a system with a mechanical HD.  Even the system does not consider it to be "degraded"  If you want to pursue this run a windows performance recorder trace.

In order to diagnose your problem we need to run Windows performance toolkit the instructions for which can be found in this wiki
If you have any questions feel free to ask
Please run the trace when you are experiencing the problem (use the boot configuration)