EDIT: I have tried all these:

Click Start, select Run and type (pressing enter after each one and wait for
the success
message):

net.exe stop wuauserv
Press Ok

Repeat for the following:
regsvr32 wuapi.dll
regsvr32 wups.dll
regsvr32 wuaueng.dll
regsvr32 wuaueng1.dll
regsvr32 wuweb.dll
regsvr32 jscript.dll
regsvr32 wucltui.dll
regsvr32 msxml3.dll
regsvr32 softpub.dll
regsvr32 atl.dll

net.exe start wuauserv

TRIED THESE TOO:
Also make sure you accepted the Microsoft Trust Certificate
To turn on automatic updating of trusted root authority certificates
http://www.microsoft.com/resources/d...s/xp/all/prodd...

1. In Control Panel, open Add or Remove Programs
2. Click Add/Remove Windows Components.
3. Select the Update Root Certificates check box.
4. Click Next, and then click Finish.

Note
.. To open Add/Remove Windows Components, click Start, click Control Panel,
click Add or Remove Programs, and then click Add/Remove Windows Components.


AND THIS ONE TOO:
Download the latest version of the Windows Update agent from here (x86):
http://go.microsoft.com/fwlink/?LinkID=91237
..... and save it to the root of your C:\ drive. After saving it to the root
of the C:\ drive, do the following:

Close all Internet Explorer Windows and other applications.

Start button --> RUN and type in:
%SystemDrive%\windowsupdateagent30-x86.exe /WUFORCE
--> Click OK.

(If asked, select "Run.) --> Click on NEXT --> Select "I agree" and click on
NEXT --> When it finishes installing, click on "Finish"...

Reboot.

Log on as an user with administrative rights and open Internet Explorer and
visit http://windowsupdate.microsoft.com/ and select to do a CUSTOM scan...

Once the scan is done, select all the critical, any of the optional software
updates you want and *none* of the option hardware updates and install them.

Reboot again.