If you are using Symantec Endpoint Protection manager as your antivirus solution then you should be aware of a known issue that can bring your server down. When SEPM downloads updates from the internet it downloads tons of them by default. In order to check this verify the size of your content folder which is located here, C:program filessymantec..symantec endpoint…managercontent
In order to change this you must go into the SEPM admin server then go to local site>properties>live update. Change the content revisions to something lower like 3.