ERROR: For security reasons DTD is prohibited in this XML document. To enable DTD processing set the ProhibitDtd property on XmlReaderSettings to false and pass the settings into XmlReader.Create method

http://social.msdn.microsoft.com/Forums/en-US/sqlkjpowerpointforsharepoint/thread/ee506212-6d65-462d-93e6-59b6f4f416c2/

Export as data feed option is not coming in SharePoint list – PowerPivot Issues

After installing PowerPivot successfully, I was not able to see ‘Export as data feed’ option in list setting ribbon menu. Here is the link which will discuss about what are the possibilities for not having that option.

http://powerpivottwins.com/2010/08/21/help-my-powerpivot-for-sharepoint-lists-atom-feed-has-fallen-and-it-can%e2%80%99t-get-up/

Some good PowerPivot installation links

Step by step guide for installing PowerPivot for single server: http://powerpivot-info.com/post/66-step-by-step-guide-on-installing-powerpivot-for-sharepoint

http://powerpivotgeek.com/server-installation/single-server-install-rtm/

How to install PowerPivot in server farm: http://msdn.microsoft.com/en-us/library/ee210708(SQL.105).aspx

PowerPivot installation videos: http://social.technet.microsoft.com/wiki/contents/articles/install-powerpivot-for-sharepoint-on-a-domain-controller.aspx