Windows 7 hangs at "Starting Windows" - but not always

A client has have a Samsung NP-RV511 laptop with Windows 7 Home Premium (64 bit).
After a recent Windows update the machine now hangs at "Starting Windows"...but not always. Very occasionally it boots up fine.

When it hangs there is initially a few minutes of disk activity and then it stops. The Windows logo pulsates and does so indefinitely. The only way out is to to do a hard reset via the power button.

It boots OK into Safe mode.

I have done chkdsk - nothing found
I have done sfc - it says some damaged files can't be corrected.

I have done many systematic configurations of selective start up in msconfig, covering start-up items and services (including microsoft services), to try and identify the culprit, but nothing makes any difference.

I have done system restore back to a number of restore points, but nothing changes.

When it does boot up correctly I have use the Samsung Update Plus tool to check all drivers and all are OK.

I am obtaining Samsung recovery media for this particular model and operating system.

In the meantime, can anyone shed any light on what's causing this issue, specifically the intermittent nature, and/or suggest a fix?

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Sajid Shaik MSystem AdminCommented:
check the event viewer

and post the system events

RaminTechnical AdvisorCommented:
JohnBusiness Consultant (Owner)Commented:
I have done SFC - it says some damaged files can't be corrected.

Try two things:

1. Make a new, test Windows User Profile (Account). Log into the new Windows Account and test startup that way.
2. Do a Windows 7 Repair Install. You need the Windows 7 DVD or a working recovery partition.
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socrossAuthor Commented:

Please see attached Event Viewer Log file.

socrossAuthor Commented:

The support tool cannot run in Safe Mode.

socrossAuthor Commented:
Hi John,

Re your suggestions:

1) Doesn't make any difference, I'm afraid.

2) You cannot do this in Safe Mode. I now have bootable USB stick with W7 (re-)installer, but if I boot from the USB and start the re-installation process it says to remove the media, reboot and re-insert it. But I can't re-boot, except into Safe Mode and you can't run the re-installation process in Safe Mode. Catch 22!
JohnBusiness Consultant (Owner)Commented:
So then you need to do a Windows 7 Repair Install. For this you need the Windows 7 DVD or a working recovery partition.
socrossAuthor Commented:

But as it can't work from a bootable USB stick, will it work from a DVD?

JohnBusiness Consultant (Owner)Commented:
Yes it should do. Boot from the DVD and select Repair
David Johnson, CD, MVPOwnerCommented:
check the event viewer for disk events... probably a failing hard drive test using the hard drive manufacturers utility
it can be a slow disk - sometimes up to speed, sometimes not.
can you image that disk, and put the image on another drive to test?
RaminTechnical AdvisorCommented:
Can you uninstall your Antivirus in safe mode  and retest.

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socrossAuthor Commented:
Uninstalled Antivirus and that seemed to fix it. Was then able to re-install Antivirus and still OK.  Thanks for suggestions guys.
socrossAuthor Commented:

Just to complete the feedback on your suggestions, I was trying to do an in-place "upgrade" not a repair install (as the latter had already been tried and did not solve the problem). But in the same way as an "in-place" upgrade (preserving applications and files) did not work from a bootable USB stick, it did not work from a DVD either. You get the same catch 22 situation where it can only run from a booted windows machine (not in safe mode).
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