Facing update problem

Yes I tried to install the updates manually.I got success in all but two.I could not find the update 'Definition Update for Windows Defender - KB915597 (Definition 1.87.836.0)' in microsoft download.If you find any link for this update,please post it.

I downloaded Security Update for Microsoft Office PowerPoint 2007 (KB982158) and saved in Desktop.But I can not install due to some unknown error.

So now it is showing 2 important update available for installation instead of 8.This means it can check for available update but can not download.

I have installed Microsoft Word 2010 (Beta) in my laptop.Can it be a reason for window update failure?

@agmath
I forgot that error 0x80072ee2 would have also another aspect.Read and try suggestions from below link.I completely forgot about this one :

Fixing Windows Update Error 0x80072ee2

No.Unfortunately it did not work for me.May be the following log file appears usefull to you.

Out of chance but download & run Readiness Tool Description of the System Update Readiness Tool for Windows Vista, for Windows Server 2008, for Windows 7, and for Windows Server 2008 R2,this tool will create CheckSur.log file in C:\Windows\Logs\CBS,attache this log to post

Additionally try disable all add-ons and extensions in IE and reset IE.May it work...

1.Internet Explorer - Enable or Disable Toolbars and Extensions Add-ons

2.Internet Explorer - Reset

My operating system is window 7 home premium 64 bit.
Is it
x64-based versions of Windows 7
or
x86-based versions of Windows 7??

agmath said:

My operating system is window 7 home premium 64 bit.
Is it
x64-based versions of Windows 7

Then you have x64-based versions of Windows 7 of course

I'm thinking about one more thing.Your problem would be caused by any harder infection which such kind of tool like Malware can't detect -it is small chance neverless it is possible.If none of previous suggestions help I suggest use LiveCD with antivir to diagnose more accurately your computer.

1.Download Dr.WEB LiveCD from here Dr.Web CureIt! — download free anti-virus! Cure viruses, Best free anti-virus scanner! and burn DVD
2.Make sure boot order in BIOS is CD-ROM,C,A -if i's unlikely you have to correct it

//Because you seem have problem with easy things I attached helpful link here:
Boot from CD - How to Boot your Computer from a Bootable CD or DVD - Boot to CD

3.Insert LiveCD to drive and boot it,next follow to the creator

To day a miracle happend.One more update was available.That update was dowloaded automatecally by my window update and also installed successfully.But the other two update could not get through.It is showing the error 80072ee2.Also the error 80070643 came back.
Do you still think it is caused by virus?
With best
Anjan

agmath said:

80072ee2.Also the error 80070643 came back.
Do you still think it is caused by virus?
With best
Anjan

I still think it's possible yes.But it would be also another reasons:3p security software.Yes I remember you tried to disable them that did nothing but sometimes disabling security software is not enough to solve problem

So uninstall completely all 3p security software if it doesn't help too then scan your system by using Dr WEB LiveCD as I said in my previous post.