Ok,lets try this steps:
<ol>
<li>Click <>Start</> <img title="Start button" src="http://support.microsoft.com/library/images/support/kbgraphics/Public/EN-US/VistaStartButton.jpg" alt="Start button" />, type services.msc in the <>Start Search</> box, and then click <>services.msc</> in the <>Programs</> list.</li>
<li>Double-click <>Background Intelligent Transfer Service</>.</li>
<li>In the <>Startup type</> box, click <>Manual</>, and then click <>Apply</>.</li>
<li>On the <>Log On</> tab, verify that the service is enabled in every hardware profile that is listed.
<>Note</> If the service is disabled in one or more hardware profiles, click the hardware profile, click <>Enable</>, and then click <>Apply</>.</li>
<li>On the <>General</> tab, click <>Start</>.</li>
</ol>
<>Note</> If BITS starts successfully, visit the Windows Update Web site or the Microsoft Update Web site to install updates. If BITS does not start successfully, go to Method 2.
<h3 id="tocHeadRef">Method 2: Rename the Windows Update Download folder</h3>
<ol>
<li>Click <>Start <img title="Start button" src="http://support.microsoft.com/library/images/support/kbgraphics/Public/EN-US/VistaStartButton.jpg" alt="Start button" /></>, type notepad in the <>Start Search</> box, and then click <>notepad</> in the <>Programs</> list.</li>
<li>Copy the following commands, and then paste them into the Notepad file.
<code>net stop wuauserv
CD %systemroot%\SoftwareDistribution
Ren Download Download.old
net start wuauserv</code>
</li>
<li>On the <>File</> menu, click <>Save as</>.</li>
<li>In the <>File name</> box, type rename.bat, and then click <>All Files (*.*)</> in the <>Save as type</> box.</li>
<li>Save the rename.bat file to the desktop.</li>
<li>Right-click the <>rename.bat</> file, and then click <>Run as administrator</>.
<div>
<div> <img title="User Account Coantrol permission" src="http://support.microsoft.com/library/images/support/kbgraphics/Public/EN-US/SecurityShield.jpg" alt="User Account Control permission" /> If you are prompted for an administrator password or for a confirmation, type the password, or click<>Continue</>.</div>
</div></li>
<li>Try to install updates again.</li>
</ol>