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Windows Defender Stopped and Won't Turn Back On


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For some unknown reason, Windows Defender disabled itself. I became aware of this when the Security Center warned me. So, I tried to turn it back on, but instead I get this error:

Windows Defender encountered an error: 0x800705b4. This operation returned because the timeout period expired.

Here is a list of a few things I did before it happened:

1) Uninstalled AVG Free 8.0

2) Deleted a folder called 'inetpub' from 'C:\' because I disabled IIS a while back and did not think I needed the folder.

3) Installed Windows Live OneCare 90-Day Trial.

I recieved the warning during the installation of OneCare.

I tried to download and install Windows Defender over this one, but I was not allowed, because it comes installed on Vista.

Please help me fix Defender. :(

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