Black screen after windows logo as it slowing the boot time [Solved]

Black screen after windows logo as it slowing the boot time

 
this is happen suddenly.
at 30 december 2013 midnight,I still use this notebook normally.but at 31 december, at afternoon ,about 1 o'clock I turned on my notebook , after the blue windows welcome screen,there are appear black screen for about 10 until 15
seconds.
then it disappear, and I see my desktop.but  al start menu icon lost, and I cannot open any progrma until about 30 second

I didnt install anything between 30 and 31 december.
then I try to look for solution until now.first I wanna know if there any viruses at my notebook.
so I scan them with updated antivirus.
first time use microsoft security esential,not found anything.then
using bitdefender antivirus,not found anything.
bitdefender is antivirus plus I already bought,so its not a free version.
Then I scan using portable scanner like malwarebytes,not found also.I ask several forum about viruses,including hijackthis forum,but also,still
not fixed my notebook..
so I give up to find virus here.
I then try to update all of my driver that have new update avaiable..
but still nothing improved...

anybody know how to detect my notebook's actual problem,and find the solution?

P.S my system restore deactived so I cannot use it..

Anwsers to the Problem Black screen after windows logo as it slowing the boot time

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This particular error can easily be resolved with a few simple steps. However, if you are not confident in your ability to use the methods below or they do not fully remove the issue on your computer, you may want to seek the assistance of a qualified repair technician who is well versed in fixing Black screen after windows logo as it slowing the boot time.

1. Back-up the Registry of your operating system.
2. Find the Registry Key: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\OSUpgrade]
3. Note: this Registry Key should already exist, if it does not exist, create it.
4. Create a brand new DWORD Value that is named AllowOsUpdate
5. Set the Value to 0x00000001.
6. Close and reopen your Control Panel.
7. Restart the Microsoft Windows.

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