Checking the impact of particular security baseline to Office SharePoint 2007

There is a SharePoint server farm consists of 2 WFE, 2 SSP and 2 DB servers (cluster). I need to Windows and IIS security baseline on all these 6 servers.

Question:

1) Can I disable default administrative share on the 2 WFE and 2 SSP servers? Any impact? If I cannot disable it, what is the justification?

2) Previously after apply the IIS security baseline as below, all the SharePoint sites were down. Some files in IIS virtual directory were missing. I wonder which security baseline setting was causing that. I wonder also whether IIS security baseline was the culprit.