Give this first a try:

1.Boot with XP CD or 6 floppy boot disk set.
2.Press R to load the Recovery Console.
3.Type: bootcfg <press enter.

And/or have a look here:

http://www.computerhope.com/issues/ch000465.htm




If the pc boots again , you can get the BITS update here manually:

http://www.microsoft.com/downloads/d...displaylang=en