How can I tell what version (if any) of BITS is installed on a machine?

I am in the process of upgrading our SMS 2003 infrastructure to SCCM 2007. I need to check which clients aren't running BITS 2.5 or later so I can roll this out before I install the SCCM clients.
How can I tell which version if any is installed on a machine? I would be looking for a file or registry entry or something like that ideally.
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Check the file version of %windir%\system32\qmgr.dll

If it is:
6.0.x.x its BITS 1.0
6.2.x.x its BITS 1.2
6.5.x.x its BITS 1.5
6.6.x.x its BITS 2.0

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NewsInternationalLtdAuthor Commented:
Thank you both for getting back so quickly. Both solutions are equally valid but the second suited my purposes more. Thank you both for your efforts.
I'm glad I could be of service and thank you for the points.
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Windows XP

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