BITS Service
Background Intelligent Transfer Service (BITS) is a component of Microsoft Windows XP. It is most commonly used by recent versions of Windows Update, Microsoft Update, Windows Server Update Services, and Systems Management Server to deliver software updates to clients, Microsoft's anti-virus scanner Microsoft Security Essentials to fetch signature updates, and is also used by Microsoft's instant messaging products to transfer files. BITS is exposed through Component Object Model (COM), making it possible to use with virtually any programming language.
It is available as a part of Windows XP Service Pack 2 Support Tools or Windows Server 2003 Service Pack 1 Support Tools and later versions of both, as well as a standard command-line tool in Windows Vista. It is declared deprecated as of Windows 7.
If u have install service pack 3, but here how you can enable BITS service :
Go to Start, Control Panel, Administrative Tools, and click on Services.
Make sure that Background Intelligent Transfer Service is set to Automatic or Manual as the startup type.
(http://s.helpdeskgeek.com/wp-content/pictures/2008/11/bitswontstart-thumb.png)
If it’s not set to Manual or Automatic, then double-click on it and change the startup type to either one of these. If the service is configured correctly, but BITS will still not start up properly, check to make sure none of the dependent services are disabled.
Again, go through the list of services and make sure all of the following are set to Automatic or Manual:
Terminal Services, Remote Procedure Call (RPC), System Event Notification, Windows Management Instrumentation Driver Extensions, COM+ Event System, DCOM Server Process Launcher
If all of the services are correctly configured, you can try to delete and reset the download queue by deleting the following two files:
%ALLUSERSPROFILE%\Application Data\Microsoft\Network\Downloader\qmgr0.dat
%ALLUSERSPROFILE%\Application Data\Microsoft\Network\Downloader\qmgr1.dat
Now try to start the BITS service by going to the command prompt and typing in net start bits. This will reset the BITS transfer queue and hopefully allow the service to start properly. If not, then continue reading!
You can also check to make sure that a missing DLL file is not preventing BITS from starting properly. Go to Start, Run and type in the following command:
depends.exe %windir%\system32\qmgr.dll
(http://s.helpdeskgeek.com/wp-content/pictures/2008/11/backgroundintelligenttransferservice-thumb.png)
If you get an error about a DLL not being found or that is missing, then it is best to run System File Checker, which will copy back all of the original Windows DLL files. Go to Start, Run, and type in CMD. At the prompt, type in
sfc /scannow
Afterwards, reboot your machine and hopefully your problem will now be fixed! If Background Intelligent Transfer Service still won’t start, post a message here and I’ll try to help! Enjoy!