The HTTP service failed to start due to the following error

Hi all,
I am experiencing some major issues with our server which is running SBS2008.
Many automatic services are not running due to the dependancy on HTTP
I recieved an error:

SOURCE: Service Control Manager Eventlog Provider
EVENT ID: 7000
The HTTP service failed to start due to the following error:
Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source.

I have run SIGVERIF and it comes back saying that HTTP.SYS is not digitally signed.
I dont know how this has happened as yesterday it was running fine.
Can anyone please help?
bestbossAsked:
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bestbossConnect With a Mentor Author Commented:
The server is backup and running properly again.
I figured the Service HTTP was not running due to the HTTP.SYS file being corrupt for some reason.
So I then looked to see if Shadow-copy had another copy of the file. It did so I check if it was signed and it was, so I replaced the
HTTP.SYS file with this older version and rebooted the server.
Problem fixed!
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