These particular custom fields are managed components that are part of the Luminate CRM package, and therefore cannot be deleted. 

The limit on creating a roll-up summary field is imposed by Salesforce.com, and can be increased by request.

To request an increased limit for the roll-up summary fields, please contact Salesforce Support directly:
Log a case: https://help.salesforce.com/HTUnauthContactSupport (or click the Need Support link on the bottom of any Salesforce page)
Phone: (415)901-7010.