[AndyT]

This is due to a problem with the ChemOffice 2008 installer (aka v11.0).
Basically, the following registry entry was erroneously removed:
<
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\BITS]
"Start"=dword:00000002
>

To fix the problem, either recreate this entry using “regedit” (see point 3 below) , or:
1) Open a text editor, e.g. Notepad
2) Copy and paste in the above 4 lines (between the "<" and ">" chars) into the editor
3) Note: This page keeps adding a space in "\Services\BITS" above - please remove this space in the editor (or ignore it in "regedit")
4) Save this as a text file somewhere with a ".reg" extension e.g. BringBITSback.reg
5) Double click on this file from windows explorer
Once this item is back in the registry, restart the PC and then BITS will be back.

This problem was fixed in the v11.0.1 installer – it does not exist in any version prior to or following v11.0.