Problem with missing HTTPFilter, IIS won't startup

Since deleting several suspicious items which Sophos Antivirus found I managed to stop Outlook Web Access from working. When I have looked into this further it appeats from an error that there are more serious issues.

When trying to start IIS the following error appears in system event log:
Event Type:      Error
Event Source:      Service Control Manager
Event Category:      None
Event ID:      7003
Date:            05/07/2009
Time:            08:12:01
User:            N/A
Computer:      FERRARI
Description:
The World Wide Web Publishing Service service depends on the following nonexistent service: HTTPFilter

I can not see how to resolve this and am not quite desperate to get OWA working again.
andrew_2706Asked:
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Glen KnightCommented:
If you have had a virus problem there may be lots of other issues your just not aware of them yet. I would do a repair install of exchange
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andrew_2706Author Commented:
I don't think the issue is with Exchange, everything else is working in Exchange, it's just IIS which will not start.
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Glen KnightCommented:
Yes but exchange/iis are very heavily linked you will probably need to remove iis then re-install it then do a repair install on exchange as once exchange is installed any problems/changes to IIS will really mess things up for exchange.
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andrew_2706Author Commented:
I foolishly reinstalled IIS and it has removed some OWA links I think, I have fixed the IIS issue with some regediting, if only i had left IIS alone instead of reinstalling it.......

Anyway, I'm now struggling to reinstall Exchange/OWA because setup on the CD as well as the SP2 CD say that the version installed is newer and I dont know how to get round that.
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Glen KnightCommented:
Try resetting your virtual directories: http://teoheras.blogspot.com/2006/02/how-to-recreate-exchange-iis-virtual.html there is also another link at the bottom of the page, I will look into the cd issue.
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Glen KnightCommented:
Microsoft document for reinstalling IIS on an exchange server confirming my procedure above: http://support.microsoft.com/kb/320202
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Windows Server 2003

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